Anatomy upper limb (flexor compartement)

Question 1

Describe superficial muscles on the anterior compartment of the forearm

Answer 1

Comprises flexor Carpi ulnaris, palmaris Longus, flexor Carpi radialis and pronator teres, all originate from a common tendon which arises from the medial epicondyle of the humerus

Question 2

Flexor Carpi ulnaris

Answer 2

Origin: medial epicondyle humerus, long origin from ulna

Insertion: pisiform

Innervation: ulnar nerve

Action: flexion and abduction of wrist

Question 3

Palmaris Longus

Answer 3

Origin: medial epicondyle of humerus

Insertion: flexor retinaculum and aponeurosis of wrist

Innervation: median nerve

Action: flexion of wrist

Addit: absent in 15% of people

Question 4

Flexor Carpi radialis

Answer 4

Origin medial epicondyle of humerus

Insertion: base of metacarpals 2 and 3

Actions: flexion and abduction of wrist

Innervation: median nerve

Question 5

Pronator teres

Answer 5

Origin: medial epicondyle of humerus, coronoid process of the ulna

Insertion: mid shaft of the radius

Actions: pronator of he forearm

Innervation: median nerve

Question 6

Flexor digitorum superficialis

Answer 6

Origin: medial epicondyle of humerus and coronoid process of ulna

Insertion: middle phalanges of digits 2-5 runs through carpal tunnel

innervation: Median nerve

Action: flexes middle phalanges if continues flexes proximal and wrist

Question 7

Flexor digitorum profondus

Answer 7

Origin: upper 3/4 of the anterior and medial aspect of the ulna and interosseous membrane and deep fascia of the forearm

Insertion: tendons pass through Carple tunnel deep to superficialis and run through superficial tendons to attach to distal phalanx of digits 2-5

Action: flexion of wrist, mcpj and ipj

Inervation:
Medial aspect which flexes 4 and 5 supplied by ulnar nerve (c8, t1)

Lateral aspect is innervated by medial nerve (as ain)

Question 8

Flexor pollicus Longus

Answer 8

Origin: grooved anterior surface of the radius extending directly below the radial tuberosity interosseous membrane and coronoid of the ulnar

Insertion: through carpal tunnel lodged between the head of flexor pollicus brevis and adductor pollicis inserting into the base of the phalanx of the thumb

Action: flexor of the thumb when the thumb is fixed aids in flexion of the wrist

Innervation: anterior interosseous branch of the medial nerve (c5-t1)

Question 9

Pronator quadratus

Answer 9

Origin: distal quarter of anterior ulna
Insertion:distal quarter of anterior radius
Action: pronation
Innervation: ain c8-t1