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ANTERIOR COMPARTMENT OF ARM & CUBITAL FOSSA
FASCIAL COMPARTMENTS OF THE UPPER ARM
CONTENTS OF ANTERIOR FASCIAL COMPARTMENT
• Muscles
• Blood vessels
• Nerves
• Structures passing through the
compartment
MUSCLES OF ANTERIOR COMPARTMENT
MUSCLES OF ANTERIOR
COMPARTMENT
b
coracobrachialis
Origin, insertion, N.S & Action
Dual N.S
THE BICEPS BRACHII
• The biceps functions primarily as strong supinator of the forearm. This action,
which is aided by the supinator muscle, requires the elbow to be at least
partially flexed.
• The biceps also functions as an powerful flexor of elbow joint, particularly
when the forearm is supinated. Functionally, this action is performed when
lifting an object, such as a bag of groceries or when performing a biceps curl.
• Both these movements are used when opening a bottle with a corkscrew:
first biceps unscrews the cork (supination), then it pulls the cork out (flexion).
• If the elbow joint is fully extended, supination is then primarily carried out by
the supinator muscle.
• Weak flexor of shoulder joint.
Cont….
• When the forearm is
in pronation, the
brachialis, brachioradialis,
and supinator function to
flex the forearm, with
minimal contribution from
the biceps brachii.
Flexed arm in the pronated position
(left); with the biceps partially
contracted and in a supinated position
with the biceps more fully contracted,
approaching minimum length (right.)
Cont….
• The brachialis muscle is innervated by the
musculocutaneous nerve, which runs on its
superficial surface, between it and the biceps
brachii.
• Part of it is also innervated by the radial nerve
(proprioceptive branch).
• Action: Most powerful flexor at elbow joint
Cont….
• The coracobrachialis
draws the humerus
forward (shoulder
flexion) and towards
the torso (shoulder
adduction).
STRUCTURES PASSING THROUGH
ANTERIOR FACIAL COMPARTMENT
BRACHIAL ARTERY
-2
Muscular branches-1
3-
-4
-5
RELATIONS OF BRACHIAL ARTERY
Anteriorly: Superficial in the upper part, overlapped
laterally by coracobrachialis and biceps.
• Upper part; Medial cutaneous nerve of forearm
• Middle part; Median nerve
• Lower part; bicipital aponeurosis
Posteriorly: Triceps, coracobrachialis, brachialis
` Laterally: Upper part: Median nerve, coracobrachialis
and biceps.
Lower part: tendon of biceps
Medially: Upper part: ulnar nerve, basilic vein
Lower part: Median nerve
NERVES OF THE ANTERIOR
COMPARTMENT
MUSCULOCUTANEOUS NERVE
Origin
Course in arm
Branches:
1. Muscular
2. Cutaneous
3. Articular
MEDIAN NERVE
Origin
Course:
Branches:
Vasomotor branches to
brachial artery
ULNAR NERVE
Origin
Course in arm: pierces the
medial intermuscular
septum and passes
behind the medial
epicondyle
Branches: None
RADIAL NERVE
Origin
Course: in posterior the
compartment of arm and
enters the anterior
compartment just above
the lateral epicondyle by
piercing the lateral
intermuscular septum
Branches:
1. Muscular
2. Articular branches to
elbow joint
CUBITAL FOSSA
BOUNDARIES
L
M
B
FLOOR OF CUBITAL FOSSA
ROOF OF CUBITAL FOSSA
CONTENTS OF CUBITAL FOSSA
SUPRATROCHLEAR LYMPH NODES
• One or two supratrochlear lymph
nodes lie in superficial fascia over
the upper part of fascia.
• Are placed above the medial
epicondyle of humerus, medial to
the basilic vein.
• Their afferents drain
the middle, ring, and little fingers,
the medial portion of the hand, and
the medial side of the forearm.
• Their efferents enter the lateral
axillary lymph nodes
CLINICAL CORRELATES
• During blood pressure
measurements, the
stethoscope is placed
over the brachial
artery in the cubital
fossa.
• The brachial pulse may
be palpated in the
cubital fossa also just
medial to the tendon.
Cont…
• The area just superficial to the
cubital fossa is often used for
obtaining intravenous access for
the purpose of intravenous
therapy or for blood sampling.

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Anterior compartment of cubital fossa and arm medicos notes.com

  • 1. ANTERIOR COMPARTMENT OF ARM & CUBITAL FOSSA FASCIAL COMPARTMENTS OF THE UPPER ARM
  • 2. CONTENTS OF ANTERIOR FASCIAL COMPARTMENT • Muscles • Blood vessels • Nerves • Structures passing through the compartment
  • 3. MUSCLES OF ANTERIOR COMPARTMENT
  • 5. THE BICEPS BRACHII • The biceps functions primarily as strong supinator of the forearm. This action, which is aided by the supinator muscle, requires the elbow to be at least partially flexed. • The biceps also functions as an powerful flexor of elbow joint, particularly when the forearm is supinated. Functionally, this action is performed when lifting an object, such as a bag of groceries or when performing a biceps curl. • Both these movements are used when opening a bottle with a corkscrew: first biceps unscrews the cork (supination), then it pulls the cork out (flexion). • If the elbow joint is fully extended, supination is then primarily carried out by the supinator muscle. • Weak flexor of shoulder joint.
  • 6. Cont…. • When the forearm is in pronation, the brachialis, brachioradialis, and supinator function to flex the forearm, with minimal contribution from the biceps brachii. Flexed arm in the pronated position (left); with the biceps partially contracted and in a supinated position with the biceps more fully contracted, approaching minimum length (right.)
  • 7. Cont…. • The brachialis muscle is innervated by the musculocutaneous nerve, which runs on its superficial surface, between it and the biceps brachii. • Part of it is also innervated by the radial nerve (proprioceptive branch). • Action: Most powerful flexor at elbow joint
  • 8. Cont…. • The coracobrachialis draws the humerus forward (shoulder flexion) and towards the torso (shoulder adduction).
  • 9. STRUCTURES PASSING THROUGH ANTERIOR FACIAL COMPARTMENT BRACHIAL ARTERY -2 Muscular branches-1 3- -4 -5
  • 10. RELATIONS OF BRACHIAL ARTERY Anteriorly: Superficial in the upper part, overlapped laterally by coracobrachialis and biceps. • Upper part; Medial cutaneous nerve of forearm • Middle part; Median nerve • Lower part; bicipital aponeurosis Posteriorly: Triceps, coracobrachialis, brachialis ` Laterally: Upper part: Median nerve, coracobrachialis and biceps. Lower part: tendon of biceps Medially: Upper part: ulnar nerve, basilic vein Lower part: Median nerve
  • 11. NERVES OF THE ANTERIOR COMPARTMENT
  • 12. MUSCULOCUTANEOUS NERVE Origin Course in arm Branches: 1. Muscular 2. Cutaneous 3. Articular
  • 14. ULNAR NERVE Origin Course in arm: pierces the medial intermuscular septum and passes behind the medial epicondyle Branches: None
  • 15. RADIAL NERVE Origin Course: in posterior the compartment of arm and enters the anterior compartment just above the lateral epicondyle by piercing the lateral intermuscular septum Branches: 1. Muscular 2. Articular branches to elbow joint
  • 20. SUPRATROCHLEAR LYMPH NODES • One or two supratrochlear lymph nodes lie in superficial fascia over the upper part of fascia. • Are placed above the medial epicondyle of humerus, medial to the basilic vein. • Their afferents drain the middle, ring, and little fingers, the medial portion of the hand, and the medial side of the forearm. • Their efferents enter the lateral axillary lymph nodes
  • 21. CLINICAL CORRELATES • During blood pressure measurements, the stethoscope is placed over the brachial artery in the cubital fossa. • The brachial pulse may be palpated in the cubital fossa also just medial to the tendon.
  • 22. Cont… • The area just superficial to the cubital fossa is often used for obtaining intravenous access for the purpose of intravenous therapy or for blood sampling.