Flexor digitorum superficialis muscle :-

Flexor digitorum superficialis muscle :-

Muscle details :-

flexor digitorum superficialis muscle

 

  • It is in the anterior compartment of the forearm. It is sometimes considered to be the deepest part of the superficial layer of this compartment .

Origin :-

  • Humeroulnar head: medial epicondyle of the humerus via the common flexor tendon, medial border of the base of the coronoid process of the ulna
    Radial head: oblique line of the radius along its supero-anterior border .

Insertion :-

  • Via four tendons attaching to the anterior surface of the middle phalanx of digits 2-5 .

Nerve supply :-

  • Median nerve (C7, C8, T1) .

Action :-

flexor digitorum superficialis muscle

  • flexes middle phalanx of fingers and assists in flexing proximal phalanx and wrist joint .

 

Plamaris longus muscle :-

Plamaris longus muscle :-

Muscle details :-

palmaris longus muscle

  • The palmaris longus is a muscle visible as a small tendon between the flexor carpi radialis and the flexor carpi ulnaris, although it is not always present.

Origin :-

  • medial epicondyle of humerus .

Insertion :-

  • flexor retinaculum and palmar aponeurosis .

Nerve supply :-

  • median nerve .

Action :-

palmaris longus muscle action

  • flexor wrist joint .

Flexor carpi radialis muscle :-

Flexor carpi radialis muscle :-

Muscle details :-

flexor carpi radialis muscle

  • The flexor carpi radialis muscle is a relatively thin muscle located on the anterior part of the forearm.

Origin :-

  • the medial epicondyle of the humerus.

Insertion :-

  • the anterior aspect of the base of the second metacarpal, and has small slips to both the third metacarpal and trapezial tuberosity .

Nerve supply :-

  • medial nerve .

Action :-

flexor carpi radialis muscle action

  • flexes and abducts hand at wrist joint .

Pronator teres muscle :-

Pronator teres :-

Muscle details :-

pronator teres muscle

  • The pronator teres muscle is located on the palmar side of the forearm, below the elbow.

Origin :-

  • medial epicondyle of humerus .

Insertion :-

  • middle of lateral aspect of shaft of radius .

Nerve supply :-

  • median nerve .

Action :-

pronator teres muscle action

  • pronation of forearm .

Brachialis muscle :-

Brachialis muscle :-

Muscle details :-

brachialis muscle

  • The brachialis (brachialis anticus) is a muscle in the upper arm that flexes the elbow joint.

Origin :-

  • lower half of the front of the humerus , including both the anteromedial and anterolateral surfaces and the anterior border .
    – superiorly the origin embraces the insertion of the deltoid .
    – medial and lateral intermuscular septa .

Insertion :-

  • coronoid process and ulnar tuberosity .
    – rough anterior surface of the coronoid process of the ulna .

Nerve supply :-

  • -musculocutaneous nerve is motor .
    – radial nerve is proprioceptive .

Action :-

brachialis muscle action

  • flexes forearm at the elbow joint .

 

Biceps brachii muscle :-

Biceps brachii muscle :-

Muscle details :-

biceps brachii muscle

 

  • a two-headed muscle that lies on the upper arm between the shoulder and the elbow. Both heads arise on the scapula and join to form a single muscle belly which is attached to the upper forearm.

Origin :-

  • Origin of Short Head: Apex of the coracoid process of the scapula.
    Origin of Long Head: Supraglenoid tubercle of the scapula.

Insertion :-

  • Both heads of the Biceps insert distally into the radial tuberosity.

nerve supply :-

  • Musculocutaneous C5,c6.

Action :-

biceps brachii muscle action

  • it is strong supinator when the forearm is flexed all screwing movements are done with it .
    – it is a flexor of the elbow .
    – the short head is a flexor of the arm .
    – the long head prevents upwards displacement of the head of the humerus .
    – it can be tested against resistace .

Coracobrachialis muscle :-

Coracobrachialis muscle :-

Muscle details :-

coracobrachialis muscle

  • The contraction of the coracobrachialis leads to two movements at the shoulder joint. On one hand, it bends the arm (flexion), and on the other hand it pulls the arm towards the trunk (adduction).

Origin :-

  • It arises from the apex of the coracoid process, in common with the short head of the biceps brachii .

Insertion :-

  • the middle 5cm of the medial border of the humerus .

Nerve supply :-

  • musculotaneous nerve (c5-c6) .

Action :-

coracobrachialis muscle action

  • flexes the arm at the shoulder joint .

Subscapularis muscle :-

Subscapularis muscle :-

Muscle details :-

subscapularis muscle

  • the group of the rotator cuff muscles.

Origin :-

  • medial two-thirds of the subscapular fossa .

Insertion :-

  • lesser tubercle of the humerus .

Nerve supply :-

  • upper and lower subscaqpular nerves (c5-c6).

Action :-

subscapularis muscle action

  • medial rotator and adductor of arm .

Teres major muscle :-

Teres major muscle :-

Muscle details :-

teres major muscle

  • The teres major muscle is one of the six muscles within the scapulohumeral muscle group.

Origin :-

  • Lower lateral border and inferior angle of the scapula .

Insertion :-

  • Medial lip of the intertubercular groove(bicipital) of the anterior humerus .

Nerve supply :-

  • The lower subscapular nerve .
  • Nerve roots:- C5, C6, and C7 .

Action :-

teres major muscle action

  • medial rotator and adductor of arm .

Teres minor muscle :-

Teres minor muscle :-

Muscle details :-

teres minor muscle

  • The teres minor is a slim, narrow muscle within the rotator cuff, located in the shoulder.

Origin :-

  • the lateral border and adjacent posterior surface of the scapula.

Insertion :-

  • the greater tubercle of the humerus. The tendon of this muscle passes across, and is united with, the posterior part of the capsule of the shoulder-joint.

Nerve supply :-

  • axillary nerve (c5,c6) .

Action :-

teres minor muscle action

  • External rotation of the arm .