Upper limb and back: Antebrachium (flexors) Flashcards
What is the origin, insertion, action and innervation of the pronator teres muscle?
ORIGIN
-Medial epicondyle and coronoid process of ulna.
INSERTION
-Lateral aspect of radial shaft.
ACTION
-Pronation
INNERVATION
-Median nerve
What are the four superficial muscles of the forearm from lateral to medial?
-Pronator teres m.
-Flexor carpi radialis
-Palmaris longus
-Flexor carpi unlaris
What is the origin, insertion, action and innervation of the flexor carpi radialis?
ORIGIN
-Medial epicondyle
INSERTION
-Base of 2nd and 3rd metacarpals
ACTION
-Abduction of wrist joint
-Flexion of wrist joint
INNERVATION
-Median nerve
What is the origin, insertion, action and innervation of the palmaris longus muscle?
ORIGIN
-Medial epicondyle
INSERTION
-Palmar aponeurosis
ACTION
-Flexion of wrist joint
-Tenses the palmar fascia
INNERVATION
-Median nerve
What is the origin, insertion, action and innervation of the flexor carpi ulnaris?
ORIGIN
-Medial epicondyle and posterior border of ulna.
INSERTION
-Pisiform, pisohamate and pisometarcapal ligaments.
ACTION
-Adduction
-Flexion of wrist joint
INNERVATION
-Ulna nerve
What is the intermediate muscle of the anterior antebrachium?
Flexor digitorium superficialis muscle
What is the origin, insertion, action and innervation of the flexor digitorium superficialis muscle?
ORIGIN
-Medial epicondyle, coronoid process of ulna, radial line.
INSERTION
-Base of the middle phalanges of medial 4 fingers.
ACTION
-Flexion of the proximal interphalangeal joint of medial 4 fingers.
INNERVATION
-Median nerve
What are the anterior deep antebrachial muscles? (3)
-Flexor digitorium profundus m.
-Flexor pollicis longus m.
-Pronator quadratus m.
What is the origin, insertion, action and innervation of the flexor digitorium profundus muscle?
ORIGIN
-Anterior and medial surfaces of the ulna shaft.
-Interosseous membrane
INSERTION
-Base of the distal phalanges of medial 4 fingers.
ACTION
-Flexion of distal interphalangeal joint of medial 4 fingers.
INNERVATION
-Medial 1/2: Ulna nerve
-Lateral 1/2: Medial nerve
What is the origin, insertion, action and innervation of the flexor pollicis longus muscle?
ORIGIN
-Upper anterior surface of the radial shaft.
-Interosseous membrane
INSERTION
-Distal phalanx of thumb
ACTION
-Flexion of the thumb
INNERVATION
-Median nerve
What is the origin, insertion, action and innervation of the pronator quadratus muscle?
ORIGIN
-Distal anterior surface of ulna.
INSERTION
-Distal anterior surface of radius.
ACTION
-Pronation
INNERVATION
-Median nerve
What are two NB branches of the radial artery at the palm?
-Princeps pollicis artery
-Superficial palmar branch
What are the branches of the ulna artery?
-Muscular branches
-Common interosseous artery:
-Anterior and posterior interosseous arteries.
-Ulna recurrent artery:
-Anterior and posterior ulna recurrent arteries.
Which artery forms the deep palmar arch?
Radial artery
Which branch anastomoses with the radial artery to form the deep palmar arch?
-Deep branch of ulna artery
Which artery forms the superficial palmar arch?
Ulna artery
Which branch anastomose with the ulna artery to form the superficial palmar branch?
-Superficial palmar branch of radial artery
Briefly explain how the carpal tunnel is formed?
The carpal arch is formed by the carpal bones.
-The roof is formed by the flexor retinaculum.
-Attached:
Medially: Pisiform and hook of hamate.
Laterally: Tubercles of the scaphoid and trapezium.
What are the contents of the carpal tunnel? (4)
-Flexor digitorium superficialis tendon
-Flexor digitorum profundus tendon
-Flexor pollicis longus tendon
-Median nerve
Wasting of thenar muscles is caused by obstruction of which nerve?
Median nerve
