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Ant. Forearm

Gross II - Zumpano Fall 2010

QuestionAnswer
What are the superficial muscles of the forearm? Pronator teres; Flexor carpi radialis, Palmaris longus, Flexor carpi ulnaris
What is the intermediate muscle of the forearm? Flexor digitorum superficialis
What are the deep muscles of the forearm? Pronator quadratus; Flexor policis longus, Flexor digitorum profundus
What nerves are found in anterior forearm? Median n. & Anterior interosseous n.
What forearm muscles are innervated by the MEDIAN n? (1)Flexor digitorum superficialis; (2)pronator teres; (3)flexor carpi radialis, (4)palmaris longus
What forearm muscles are innervated by the ANTERIOR INTEROSSEOUS n.? (1) Pronator quadratus; (2) Flexor policis longus; (3) 1/2 of Flexor digitorum profundus (digits 2 & 3)
What forearm muscles are innervated by ULNAR n.? (1) 1/2 flexor digitorum profundus (digits 4 & 5); (2) Flexor carpi ulnaris
Deep branch of radial n. is correlated with what motor functions? Extensors of posterior forearm
Median n. supplies what types of muscles? Wrist flexors & thenar muscles
Which nerve does not have a reflex associated with the muscle? How is it tested? Median n. Wrist flexion
Origin of PRONATOR TERES Humeral head = medial epicondyle; ulnar head = coronoid process
Insertion of PRONATOR TERES Midway along lateral surface of radius
Innervation of PRONATOR TERES Median n.
Spinal level of PRONATOR TERES C7
Action of PRONATOR TERES Secondary pronator (recruited when force or speed is needed); Rotation of radius on ulna, turning palm medially & backward
Origin of FLEXOR CARPI RADIALIS Medial epicondyle
Insertion of FLEXOR CARPI RADIALIS Base of 2nd and 3rd metacarpal
Innervation of FLEXOR CARPI RADIALIS Median n.
Spinal level of FLEXOR CARPI RADIALIS C7
Actions of FLEXOR CARPI RADIALIS (1) Flexes 2nd carpometacarpal joint and hand at wrist; (2) Radial deviation (abduction) w/ extensor carpi radialis; (3) Steadies hand w/ flexor carpi ulnaris
Origin of PALMARIS LONGUS Medial epicondyle
Insertion of PALMARIS LONGUS Flexor retinaculum of palmar aponeurosis
Function of Palmar Aponeurosis 1. Protects nerves & vessels in hand; 2. Anchors skin
Innervation of PALMARIS LONGUS Median n.
Spinal level of PALMARIS LONGUS C8
Actions of PALMARIS LONGUS Tenses palmar aponeurosis & weakly flexes wrist
Origin of FLEXOR CARPI ULNARIS Medial epicondyle; medial aspect of olecranon process; posterior border of ulna
Insertion of FLEXOR CARPI ULNARIS Pisiform; hamate; base of 5th metacarpal
Innervation of FLEXOR CARPI ULNARIS Ulnar n.
Spinal levels of FLEXOR CARPI ULNARIS C7, C8
Actions of FLEXOR CARPI ULNARIS (1) Flexes 5th carpometacarpal joint; (2) adduction of hand (ulnar deviation) with extensor carpi ulnaris; (3) steadies wrist with flexor carpi radialis.
Functions of Flexor Retinaculum (1) keep tendons in wrist/carpal tunnel (prevents bow stringing) (2) Increases strength of tendons that pass under it.
Origin of FLEXOR DIGITORUM SUPERFICIALIS Humeroulnar head = medial epicondyle, coronoid process of ulna; Radial head = anterior surface of radius distal to radial tuberosity
Insertion of FLEXOR DIGITORUM SUPERFICIALIS 4 tendons which split to attach at medial & lateral sides of bases of middle phalanges for digits 2-5
Innervation of FLEXOR DIGITORUM SUPERFICIALIS C8
Action of FLEXOR DIGITORUM SUPERFICIALIS "power grip muscle" flexes proximal interphalangeal joints and metacarpophalangeal joints
Origin of FLEXOR DIGITORUM PROFUNDUS UPPER 3/4TH OF ANTEROMEDIAL ASPECT OF ULNA & ULNAR HALF OF INTEROSSEOUS MEMBRANE
Insertion of FLEXOR DIGITORUM PROFUNDUS Its 4 tendons pass thru tendons of FDS at bases of middle phalanges to insert at bases of distal phalanges of digits 2-5
Innervation of FLEXOR DIGITORUM PROFUNDUS Anterior Interosseous n.
Spinal level of FLEXOR DIGITORUM PROFUNDUS C8
Action of FLEXOR DIGITORUM PROFUNDUS Flexes distal interphalangeal joints (DIPs) after the PIPs are flexed by FDS. (Gentle grip flexor & weak wrist flexor)
Origin of FLEXOR POLLICIS LONGUS Radial head = anterior surface of radius & interosseous membrane; Humeral head = medial epicondyle & coronoid process of ulna
Insertion of FLEXOR POLLICIS LONGUS Base of distal phalanx of thumb
Innervation of FLEXOR POLLICIS LONGUS Anterior Interosseous n.
Spinal level of FLEXOR POLLICIS LONGUS C8
Action of FLEXOR POLLICIS LONGUS Flexes interphalangeal joint and metacarpophalangeal joint of thumb
Origin of PRONATOR QUADRATUS Distal 1/4th of anterior surface of ULNA
Insertion of PRONATOR QUADRATUS Distal 1/4th of anterior surface of RADIUS
Action of PRONATOR QUADRATUS Principle pronator of forearm
What muscle is recruited for forceful/rapid pronation? Pronator teres
What are the entrapment sites of the median n? (1) medial intermuscular septa; (2) pronator teres; (3) FDS/FDP tunnel; (4) Pronator quadratus (AIN); (5) carpal tunnel; (6) FPB/APB
palmar cutaneous n. supplies what area of hand? heel of hand
Created by: mrw2013 on 2010-10-02



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