Anatomy 1 - Arm muscles Flashcards
Origin of deltoid (clavicular, acromial, spinal heads)?
- Lateral third of clavicle
- Acromion
- Spine of scapula
Insertion of deltoid (clavicular, acromial, spinal heads)?
Deltoid tuberosity of humerus
Function of deltoid (clavicular, acromial, spinal heads)?
- Clavicular head:
F, IR, horizontal adduction arm at shoulder joint - Acromial head: ABd arm at shoulder joint
- Spinal head:
E, ER, horizontal abduction arm at shoulder joint
Origin of coracobrachialis?
Coracoid process of scapula
Insertion of coracobrachialis?
Medial surface of humeral shaft
Function of coracobrachialis?
ADD, F, horizontal ADD arm at shoulder joint
+ stabilises shoulder/glenohumeral joint
Origin of brachialis?
Anterior distal half of humerus
Insertion of brachialis?
- Ulnar tuberosity
- Anterior surface of coronoid process of ulna
Function of brachialis?
Flexion of forearm at elbow joint
Origin biceps brachii (short/long head)?
- Long head:
Supraglenoid tubercle of scapula - Short head:
Apex of coracoid process of scapula
Insertion biceps brachii (short/long head)?
- Radial tuberosity
- Deep fascia of forearm
Function biceps brachii (short/long head)?
- F, supination of forearm at elbow joint
- F at shoulder joint
Origin triceps brachii (long, medial, and lateral head)?
- Long head:
Infraglenoid tuberosity of scapula - Medial head:
Posterior surface of the humerus (inferior to radial groove) - Lateral head:
Posterior surface of humerus
(superior to radial groove)
Insertion triceps brachii (long, medial, and lateral head)?
- Olecranon of ulna
- Fascia of forearm
Function triceps brachii (long, medial, and lateral head)?
- E of forearm at elbow joint
- E, ADD of arm at shoulder joint (long head)
Origin pronator quadratus?
Distal anterior surface of ulna
Insertion pronator quadratus?
Distal anterior surface of radius
Function pronator quadratus?
Pronation of forearm at proximal radioulnar joint
Origin flexor pollicis longus?
- Anterior surface of the radius
- Interosseous membrane
Insertion flexor pollicis longus?
Palmar surface of distal phalanx of digit 1 (thumb, pollex)
Function of flexor pollicis longus?
Flexion of distal phallanx of digit 1 at metacarpophangeal and interphalangeal joint 1
Origin flexor digitorum profundus?
- Proximal half of anterior medial surfaces of ulna
- Interosseous membrane
Insertion flexor digitorum profundus?
Base of palmar surfaces of distal phalanges of digits 2-5
Function flexor digitorum profundus?
- F of middle and proximal phalanges of digits 2-5 at metacarpophalangeal and interphalangeal joints
- F of hand at wrist joint
(same as flexor digitorum superficialis)
Origin of flexor digitorum superficialis?
- Medial epicondyle of humerus
- Coronoid process of ulna
- Proximal half of anterior border of radius (inferior to radial tuberosity)
Insertion flexor digitorum superficialis?
Middle phalanges of digits 2-5
Function of flexor digitorum superficialis?
- Flexion of middle and proximal phalanges of digits 2-5 at metacarpophalangeal and interphalangeal joints
- F of hand at wrist joint
(same as flexor digitorum profundus)
Origin flexor carpi radialis?
Medial epicondyle of humerus
(like palmaris longus)
Insertion flexor carpi radialis?
Base of metacarpals 2 and 3
Function flexor carpi radialis?
- F, ABd (radial) of hand at wrist joint
- Pronation of forearm at elbow joint
Origin flexor carpi ulnaris?
- Medial epicondyle of humerus
- Olecranon of ulna
Insertion flexor carpi ulnaris?
- Pisiform
- Hamate
- Base of metacarpal 5
Function flexor carpi ulnaris?
F, ADD (ulnar deviation) of hand at wrist joint
Origin palmaris longus?
Medial epicondyle of humerus
(like palmaris longus)
Insertion palmaris longus?
- Flexor retinaculum
- Palmar aponeurosis
Function palmaris longus?
- F of hand at wrist joint
- Tenses palmar aponeurosis
