2. Muscles That Move the Pectoral Girdle
īŽ Originate on the axial skeleton and insert on the clavicle and
scapula.
īŽ Stabilize the scapula and move it to increase the armâs angle of
movements.
īŽ Some of the superficial muscles of the thorax are grouped together
according to the scapular movement they direct.
īą elevation, depression, protraction, or retraction
3. The muscles of back
Superficial group
īŽ Trapezius
īŽ Latissimus dorsi
īŽ Levator scapulae
īŽ Rhomboideus
Deep group
īŽ Erector spinae
īŽ Splenius
īŽ Thoracolumbar fascia
4. The muscles of thorax
Extrinsic muscles
īŽ Pectoralis major
īŽ Pectoralis minor
īŽ Serratus anterior
Intrinsic muscles
īŽ Intercostales externi
īŽ Intercostales interni
īŽ Intercostales intimi
5. The Muscles of Upper Limb
Muscles of shoulder
īŽ Deltoid
īŽ supraspinatus
īŽ Infraspinatus
īŽ Teres minor
īŽ Teres major
īŽ subscapularis
6. Major muscles of upper limb
Deltoid
īŽ Origin: lateral third of
clavicle, acromion, and spine
of scapula
īŽ Insertion: deltoid tuberosity
of humerus
īŽ Action: abductsīŧflexes and
medically rotates, extends,
and laterally rotates arm
7. Teres major
īŽ Origin: dorsal surface
of inferior angle of
scapula
īŽ Insertion: crest of
lesser tubercle of
humerus
īŽ Action: medially
rotates and adducts
arm
9. Arm Muscles That Move the Shoulder/Elbow
Joint
īŽ (Flexor) compartment
īŽ Posterior (extensor) compartment
īŽ Anterior compartment
īą primarily contains shoulder/elbow flexors
īŽ Posterior compartment contains elbow extensors
īą the principal flexors
īŽ biceps brachii, brachialis, and brachioradialis
īą muscles that extend the elbow joint
īŽ triceps brachii and the anconeus
10.
11. Muscles of arm
īŽ Antererior group
īą Biceps brachii
īą Coracobrachialis
īą Brachialis
īŽ Posterior group â
triceps brachii
12. Biceps brachii
īŽ Origin: long head,
supraglenoid tubercle; short
head, coracoid process
īŽ Insertion: radical tuberosity
īŽ Action: supinator of forearm,
flexor of elbow joint, weak
flexor of should joint
Pronator teres
īŽ Origin: medical epicondyle of
humerus and deep fascia of
forearm
īŽ Insertion: middle of lateral
surface of radius
īŽ Action: pronation of forearm
and flexion of elbow
13. Triceps brachii
īŽ Origin: long head,
infraglenoid tubercle; lateral
head, above groove for
radical n., medical head,
below groove for radical n.
īŽ Insertion: olecranon of ulna
īŽ Action: extends elbow joint),
long head can extend and
adduct shoulder joint
14. Surface anatomy
M. triceps brachii
caput longum, medialis, lateralis
Surface elements
Skin thick and movable
Subcutaneous tissue well expressed
n. cutaneus brachii posterior
n. cutaneus brachii lateralis inferior
n. cutaneus antebrachii posterior
Posterior of the arm
15. Deep structures
Đ. Fascia brachialis
- Thick, thins distally
B. Neurovascular bundles
1. Upper - in canalis humero-muscularis, between:
- sulcus n. radialis
- medial and lateral head of m. triceps brachii
1.1. n. radialis â lies on the humerus
- n. cutaneus brachii lateralis inerior
- n. cutaneus antebrachii posterior
- rr. musculres
1.2. a. profunda brachii
- a. collateralis media
- collateralis radialis
19. Anterior elbow
Surface anatomy
Three eminences
Two grooves
Elements
Lateral groove - v. cephalica, n. cutaneus
antebrachii lateralis
Medial groove â v. basilica, n. cutaneus
antebrachii medialis
V. mediana cubiti
20. Deep structures
Đ. Muscles
Flexors of forearm â medial eminence
Extensors of forearm â lateral eminence
Brachial muscles, mm. biceps, brachialis â
middle eminence
21. Deep structures
B. Vessels and nerves
Medial bundle - between m. biceps brachii and pronator
teres
- a.v. brachialis, n. medianus
Lateral bundle - between m. brachialis and
brachioradialis
- n. radialis, a. collateralis radialis, a. recurrens radialis
C. Cubital fossa
Boundaries
- m. brachioradialis (lateral), m. pronator teres (medial)
Content
- tendo m. brachialis, m. biceps brachii, bursa bicipitoradialis
22. Layers of the elbow
Venous
1 v. cephalica
2 v. basilica
3 v. mediana cubiti
Apponeurotic
1 aponeurosis bicipis
2 tendo m. biceps brachii
23. Neurovascular
1 a. brachialis
2 n. medianus
Muscle
1 m. supinator
2 m. brachialis
3 tendo m. biceps brachii
Bone
1 humerus
2 radius
3 ulna
27. Arteries of upper limb
Axillary artery
īŽ Continuation of subclavian artery at
lateral border of first rib
īŽ Becomes brachial artery at lower
border of teres major
īŽ Divided into three parts by overlying
pectoralis minor
īą First portion, above muscleīŧgives rise
to thoracoacromial a.
īą Second portion, behind muscleīŧgives
rise to lateral thoracic a.
īą Third portion, below muscleīŧgives rise
to subscapular a.
īŽ divides into throcodorsal a.
īŽ and circumflex scapular a.
īą anterior and posterior humeral
circumflex a.;
28.
29. Brachial artery
īŽ Continuation of axillary artery
īŽ Divides into radial and ulnar
arteries at level of neck of radius
īŽ Branches
īą Deep brachial a. accompanies
radial nerve
īą Superior ulnar collaeral a.
accompanies ulnar nerve
īą Inferior ulnar collateral a.
30. Radial artery and branches
īŽ Radial recurrent a.
īŽ Superfical palmar branch
īŽ Principal artery of thumb
Ulnar artery and branches
īŽ Ulnar recurrent a.
īŽ Common interosseous artery
īą Anterior interossous a.
īą Posterior interosseous a.
īŽ Deep palmar branch
31. īŽ Basilic vein
īą Arises from the medial side of the
dorsal venous rete of hand
īą Ascends on the ulnar side of forearm
to the elbow and then in the medial
bicepital brachii furrow to middle of
the arm where it pierces the deep
fascia and joins the brachial vein or
axillary vein
īŽ Median cubital vein
links cephalic vein and basilic vein in
the cubital fossa. It is a frequent site
for venipuncture to remove a sample
of blood or add fluid to the blood
32. The lymphatic drainage of upper limb
Lymphatic vessels
īŽ Superficialīŧfollow the
superficial veins, drain into
supratrochlear and axillary
lymph nodes
īŽ Deepīŧaccompany main vessels,
end in axillary lymph nodes
Lymph nodes
īŽ Cubital lymph node: lies above
medial epicondyle of humerus
īŽ Axillary lymph nodeīŧarranged
in five groups
33. Axillary lymph nodes
Arranged in five groups
īŽ Lateral lymph nodes lie around
the distal end of axillary vein ,
receiving drainage from the arm,
forearm, and hand
īŽ Pectoral lymph nodes lie along
lateral thoracic vessels, receive
afferents from anterior thoracic wall
including central and lateral portion of
mamma
īŽ Subscapular lymph node along
subscapular vessels, receive lymph
from nape and scapular region
īŽ Efferents above three groups pass to
central lymph node
34. Brachial plexus
Formation:
īŽ Five roots: anterior rami of C5-C8
and T1 spinal nerves, roots C5-
C7give rise to long thoracic n.
īŽ Three trunks
īą Upper trunk formed by the joining of
roots C4,C5,C6.
īą Middle trunk continuation of root C7.
īą Lower trunk formed by the joining of
roots C8 and T1.
īŽ Six divisions: above clavicle,
trunks form anterior and posterior
divisions
īŽ Three cords: below clavicle,
divisions form three cords that
surround the second portion of
axillary a.
35. Position:
passes through the scalene fissure to
posterosuperior of subclavian artery, then
enters the axilla to form lateral, medial and
posterior cords
Main branches
īŽ Lateral cord
īą Musculocutaneous n.
īą Lateral root to median n.
īŽ Medial cord
īą Medial root to median n.
īą Ulnar n.
īą Medial brachial cutaneous n.
īą Medial antebrachial cutaneous n.
38. Median nerve
Supplies:
īŽ Flexors of forearm except
brachioradialis,
īŽ Flexor carpi ulnaris
īŽ flexor digitorum profundus - ulnar half
īŽ Thenar except adductor pollicis, two
lateral lumbricals;
īŽ Skin of thenar, central part of palm,
palmar aspect of radial three and one-
half fingers, including middle and
distal fingers on dorsum
Injury: Ape hand
īŽ produces sign of benediction,
the index and middle fingers cannot
be flexed and the thumb cannot be
opposed
39. Ulnar nerve
Supplies:
īŽ flexor carpi ulnaris,
īŽ ulnar half of flexor digitorum
profundus,
īŽ hypothenar muscles, interossei,
īŽ 3rd and 4th lumbricals and adductor
pollicis;
īŽ skin of hypothenar, palmar surface
of ulnar one and one-half fingers,
ulnar half of dorsum of hand,
posterior aspect of ulnar two and
one-half fingers
Injury: claw hand
40. Radial
Supplies:
īą Extensor muscles of arm and
forearm,
īą Brachioradialis;
īą skin on back of arm, forearm,
and radial side of dorsum of
hand and radial two and one-
half fingers
Injury: Wrist drop
41. Axillary nerve
Supplies:
īą Deltoid and teres
minor muscle;
īą skin over deltoid and
upper posterior aspect
of arm
Injury:
īą deltoid and teres minor
paralysis (loss of
shoulder abdution and
wheel external rotation)
īą loss of sensation over
the deltoid
42. Forearm Muscles
Supinate and Pronate
īŽ Supinator muscle supinates the forearm.
īŽ Biceps brachii supinates the forearm.
īŽ Pronator teres and pronator quadratus pronate the forearm.
Move the Wrist Joint, Hand, and Fingers
īŽ Muscles in the forearm move the hand at the wrist and/or the fingers.
īŽ Extrinsic muscles of the wrist and hand originate on the forearm, not
the wrist or hand.
īŽ Tendons of forearm muscles typically are surrounded by tendon
(synovial) sheaths and held adjacent to the skeletal elements by strong
fascial structures.
īŽ At the wrist, the deep fascia of the forearm forms thickened, fibrous
bands termed retinacula.
43. īŽ The forearm extends
from elbow to wrist.
īŽ It posses two bones
radius laterally & Ulna
medially.
īŽ The two bones are
connected together
by the interosseous
membrane.
īŽ This membrane
allows movement of
Pronation and
Supination while the
two bones are
connected together.
īŽ Also it gives origin for the
deep muscles.
44. ī§Sheath of deep fascia
attached to the posterior
border of the ulna .
ī§The fascial sheath,
interosseous membrane &
fibrous intermuscular septa,
divide the forearm into 3
compartments, each
having its own muscles,
nerves, and blood supply.
Fascial Compartments of the Forearm
45. I-Superficial: 4
ī Pronator teres
ī Flexor carpi radialis
ī Palmaris longus
ī Flexor carpi ulnaris
II-Intermediate: 1
ī Flexor digitorum superficialis
These muscles: 8
ī§ Act on the elbow & wrist
joints and those of the
fingers.
ī§ Form fleshy masses in the
proximal part and become
tendinous in the distal part
of the forearm.
âĸArranged in three groups:
III- Deep: 3
ī Flexor digitorum profundus
ī Flexor pollicis longus
ī Pronator quadratus
FLEXOR GROUP
46. Superficial Flexors:
īŽ They arise - more or
less- from the
common flexor origin
(front of medial
epicondyle).
īŽ All are supplied by
median nerve except
one, flexor carpi
ulnaris, FCU (ulnar).
īŽ All cross the wrist
joint except one,
pronator teres, (PT).
47. Muscles of forearm
īŽ Superficial layer
īą Brachioradialis
īą Pronator teres
īą Flexor carpi radialis
īą Palmaris longus
īą Flexor carpi ulnaris
īŽ common flexor origin (front of
medial epicondyle)
īŽ supplied by median nerve except
flexor carpi ulnaris
īŽ All cross the wrist joint except
pronator teres
48. Second layer
Flexor digitorum superficials
Origin:
īŽ Common flexor origin,
īŽ Coronoid process of ulna;
īŽ Anterior surface of radius
Insertion:
īŽ Base of middle phalanges of 2nd to 5th fingers.
Action:
īŽ Flexes middle and proximal phalanges of 2nd
to 5th fingers, and the hand
50. Lateral compartment (3)
īą Brachioradialis
īą Extensor carpi radialis longus
īą Extensor carpi radialis brevis
īŽ Common extensor origin,
(front of lateral epicondyle of
the humerus), EXCEPT, 2 (BR
& ECRL).
īŽ Cross the wrist EXCEPT
brachioradialis.
īŽ Supplied by deep branch of
radial nerve
51. Posterior compartment (8)
īŽ Superficial layer (3)
īŽ Extensor digitorum
īŽ Extensor digiti minimi
īŽ Extensor carpi ulnaris
īŽ Common extensor origin, (front of
lateral epicondyle of the humerus),
īŽ Cross the wrist.
īŽ Supplied by deep branch of radial
nerve
53. Extensor carpi radialis brevis:
base of 3rd metacarpal bone.
Extensor digitorum:
Extensor expansion of the
medial 4 fingers.
Extensor digiti minimi:
Extensor expansion of the
little finger.
Extensor carpi ulnaris:
Base of the 5th metacarpal
bone.
INSERTION
54. Supination
and
pronation
It occurs in the superior
and inferior radioulnar
joints;
Muscles produce
supination
ī§ Biceps brachii.
ī§ Supinator.
Muscles produce
pronation
ī§ Pronator teres.
ī§ Pronator quadratus.
NB. Brachioradialis put
the forearm in midprone-
position.
56. Muscles of hand (palm)
īŽ Lateral group thenar (4)
īą Abductor pollicis brevis
īą Flexor pollicis brevis
īą Opponens pollicis
īą Adductor pollicis
īŽ Action: flex, abduct, adduct and
oppose thumb
īŽ Medial group hypothenar (3)
īą Abductor digiti minimi
īą Flexor digiti minimi brevis
īą Opponens digiti minimi
īŽ Action: flex, abduct , and oppose
little finger
57. Intermedial group
īŽ Lumbricals (4) flex
fingers at MP joints;
extend fingers at IP
joints
īŽ Palmar interossei (3)
adduct fingers towards
middle finger at MP
joints
īŽ Dorsal interossei (3)
abduct fingers away
from middle finger at
MP joints
58. Arteries of upper limb
Axillary artery
īŽ Continuation of subclavian artery at
lateral border of first rib
īŽ Becomes brachial artery at lower
border of teres major
īŽ Divided into three parts by overlying
pectoralis minor
īą First portion, above muscleīŧgives rise
to thoracoacromial a.
īą Second portion, behind muscleīŧgives
rise to lateral thoracic a.
īą Third portion, below muscleīŧgives rise
to subscapular a.
īŽ divides into throcodorsal a.
īŽ and circumflex scapular a.
īą anterior and posterior humeral
circumflex a.;
59.
60. Brachial artery
īŽ Continuation of axillary artery
īŽ Divides into radial and ulnar
arteries at level of neck of radius
īŽ Branches
īą Deep brachial a. accompanies
radial nerve
īą Superior ulnar collaeral a.
accompanies ulnar nerve
īą Inferior ulnar collateral a.
61. Radial artery and branches
īŽ Radial recurrent a.
īŽ Superfical palmar branch
īŽ Principal artery of thumb
Ulnar artery and branches
īŽ Ulnar recurrent a.
īŽ Common interosseous artery
īą Anterior interossous a.
īą Posterior interosseous a.
īŽ Deep palmar branch
62. Superficial palmar arch
īŽ Formed by ulnar artery and
superficial palmar branch
of radial artery
īŽ Curve of arch lies across
the palm, level with the
distal border of fully
extended thumb
īŽ Gives rise to three common
palmar digital arteries each
then divides into two
proper palmar digital
arteries
63. Deep palmar arch
īŽ Formed by radial artery
and deep palmar branch of
ulnar artery
īŽ Curve of arch lies across
upper part of palmar at
level with proximal border
of extended thumb
īŽ Gives rise to three palmar
metacarpal arteries
64. Veins of the upper limb
Deep veins: accompany the arteries of
the same region and bear similar
names
Superficial veins
īŽ Cephalic vein
īą Arises from the lateral side of the
dorsal venous rete of hand
īą Ascends on radial side of the forearm
to the elbow and then in the lateral
side of biceps brachii furrow,
continues up the arm in the
deltopectoral groove and then to the
infraclavicular fossa, where it pierces
clavipectoral fascia to drain into
axillary vein