Download COMPARTMENTS AND MUSCLES OF ARM

COMPARTMENTS AND MUSCLES
OF ARM
LEARNING OBJECTIVES
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KNOW THE COMPARTMENTS OF ARM AND HOW THEY
ARE FORMED
UNDERSTAND THE MUSCLES AND THEIR ACTIONS
FOUND IN THE ARM
CLINICAL ASPECT RELATED TO THE TOPIC
LECTURE OUTLINE
MEDIAL INTERMUSCULAR SEPTUM
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It extends along the medial supracondylar line behind the
coracobrachialis insertion and fades out above b/w the muscle
and the long head of triceps
It gives origin to most medial fibres of brachialis and the medial
head of triceps
It is pierced by the ulnar nerve and the ulnar collateral artery
LATERAL INTERMUSCULAR SEPTUM
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It extends along the medial supra-condylar line and fades out
behind the insertion of deltoid.
Posteriorly the medial head of triceps arises from it
It is pierced by the radial nerve and the profunda brachii artery
ANTERIOR AND POSTERIOR COMPARTMENTS
Arm
A. Anterior arm muscles are Flexors of forearm/elbow joint
1. Biceps brachii
2. Brachialis
3. Coracobrachialis
B. Posterior arm muscles are Extensors of the forearm /
elbow joint
1. Triceps brachii
ATTACHEMENTS OF MUSCLES OF ARM
Biceps brachii muscle
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Origin
: Short head; Coracoid process
: Long head; Supraglenoid tubercle
Insertion : Radial tuberosity, bicipital aponeurosis
Action
: Supination, flexes elbow
Nerve
: Musculocutaneous nerve
Coracobrachialis muscle
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Origin
Insertion
Action
Nerve
: Coracoid process
: Humerus, middle of body,medial
: Flexion (flexes shoulder)
: Musculocutaneous nerve
Brachialis muscle
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Origin
Insertion
Action
Nerve
: Humerus, ant. surface distal 1/2
: Ulna, coronoid process, ulnar tuberosity
: Flexes elbow
: Musculocutaneuos n. & radial n.
Triceps brachii muscle
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Origin : Long head;Scapula, infraglenoid tubercle
: Lateral head; Humerus, post. surface above groove for radial nerve
: Medial head; below groove for radial n.
Insertion : Ulna, olecranon process
Action : Extends elbow
Nerve : Radial nerve
CLINCAL ASPECT
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TENOSYNOVITIS OF BICEPS TENDON
COMPARTMENT SYNDROME
BICEPS AND TRICEPS JERK
DISUSE ATROPHY OF MUSCLES