describes the anterior compartment muscles, vessels and nerves with their clinical significance

1. FRONT OF ARM
Prof RUCHIRA SETHI
UNS ASMC Jaunpur

2. LEARNING OBJECTIVES
1. To understand the surface landmarks of the arm(brachium)
and about the muscular compartments
2. To describe the muscles of anterior compartment of arm
with their origin, insertion, nerve supply and action
3. To describe the course and branches of Brachial artery
4. To learn about the course and distribution of
Musculocutaneous nerve.

3. 1. SURFACE LANDMARKS
 Arm is the region between the shoulder and elbow .
 Communicates supero-medially with axilla
 Inferiorly structures pass from arm to forearm via cubital fossa.
1.Greater tubercle —lateral and below acromion process
2. Medial epicondyle of humerus —Prominent bony projection on
medial side of flexed elbow
3. Lateral epicondyle —depression on posterolateral part of extended
elbow
4. Olecranon process of ulna —most prominent bony projection
between lateral and medial epicndyles in posterior part of elbow
5. Deltoid and Biceps muscle

4. 1. COMPARTMENTS
 The deep fascia
encloses the arm like a sleeve
and sends fascial septa to gain
attachment to the medial and
lateral supracondylar ridges.
 This divides the arm into
two compartments:
anterior and posterior

6. STRUCTURES OF THE ANTERIOR
COMPARTMENT ARE:
1. Muscles: Biceps Brachii, Brachialis and
Coraco-brachialis (BBC)
2. Artery: Brachial Artery
3. Nerve: Musculocutaneous nerve

8. 2. MUSCLES- BICEPS BRACHII

10. NERVE SUPPLY: Musculocutaneous nerve
(C5,C6,C7)
ACTION:
1. Strong supinator of forearm in semi-
flexed position
2. Flexor of forearm
3. Weak flexor at shoulder joint

11. 2. MUSCLES-BRACHIALIS
NERVE
SUPPLY:
Musculocutaneous
nerve in medial
2/3 and radial
nerve in lateral 1/3
ACTION: strong
flexor of elbow

12. 2. MUSCLES-CORACOBRACHIALIS
NERVE
SUPPLY:
Musculocut
aneous
nerve
ACTION:
weak flexor
and
adductor of
arm

13. ANATOMICAL EVENTS AT MID SHAFT
LEVEL OF HUMERUS

14. 4. BRACHIAL
ARTERY

15. BRANCHES:
1. Profunda brachii
2. Muscular branches
3. Superior ulnar
collateral
4. Inferior ulnar
collateral
5. Nutrient artery
6. Terminal branches:
radial & ulnar

16. OTHER NERVES IN ARM

17. MEDIAN N:
1. Nerve To Pronator Teres Just
Above Elbow
2. Nerve To Artery
3. Nerve To Elbow Joint
ULNAR NERVE:
No Branch In Arm
RADIAL NERVE:
1. N. To Brachialis
2. N. To Brachioradialis
3. N. To Ecrl
4. Deep Radial N.
5. Superficial Radial N.

18. 4.MUSCULOCUTANNEOUS NERVE

20. REVIEW TIME

21. 1. First branch of brachial artery is..............
2. Terminal branches of Brachial artery are at
the level of ............
3. Supination action of Biceps Brachii is in
.........elbow.
4. Musculocutanneous nerve
pierces...........muscle.
5. Musculocutanneous nerve is a branch from
.........cord of Brachial plexus.