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121 terms

Anatomy quiz 1: muscle origin, insertion, innervation, action

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Trapezius: origin
-Medial third of superior nuchal line
-Ligamentum nuchae
-Tips of spines of C7, all thoracic vertebrae, supraspinous ligaments
Trapezius: insertion
-Lateral third of clavicle
-Medial aspect of acromion and superior margin of crest of the spine of scapula
-Medial aspect of spine of scapula
Trapezius: innervation
-Spinal Accessory nerve (CN XI)
-Sensory branches from cervical plexus- C3 & C4
Trapezius: action
Scapula Rotation so glenoid cavity faces superiorly
-Upper (elevates acromion)
-Middle (retracts scapula)
-Lower (Depresses medial end of scapula spine)
Latissimus dorsi: origin
-Tips of lower six thoracic spines (T7-T12)
-Thoracolumbar fascia
-Outer lip of iliac crest
-Lower 3-4 ribs
-Fleshy slip from back of interior angle of scapula
Latissimus dorsi: insertion
Floor of intertubercular sulcus of the humerus
Latissimus dorsi: innervation
Thoracodorsal nerve
Latissimus dorsi: action
-Adduction (Humerus)
-Medial Rotation (Humerus)
-Extension (Humerus)
Levator scapulae: innervation
-Dorsal scapular nerve (ventral ramus of C5)
-C3 and C4
Rhomboideus major and minor: innervation
Dorsal scapular nerve (ventral ramus of C5)
Serratus Posterior superior: action
Respiration
Serratus posterior inferior: action
Respiration
Erector spinae: innervation
Dorsal rami of spinal nerves
Erector spinae: action
-Acting bilaterally- extend vertebral column & head
-Acting unilaterally- bend vertebral column laterally
Pectoralis major: origin
-Clavicular head: medial half of anterior portion
-Sternocostal Head: sternum anterior surface, upper 6 costal ribs/cartilage
Pectoralis major: insertion
-Flat bilaminar tendon to the crest of the greater tubercle of the humerus (Lateral lip of the Bicipital groove)
Pectoralis major: innervation
Medial and Lateral Pectoral nerves
Pectoralis major: action
-Adduction
-Medial Rotation (Humerus)
-Flexion of the arm at the shoulder joint
Pectoralis minor: origin
Arises from ribs 3, 4, 5 (close to costal cartilage)
Pectoralis minor: insertion
Medial border and upper surface of coracoid process
Pectoralis minor: innervation
Medial and Lateral Pectoral Nerves (from the medial and lateral cords)
Pectoralis minor: action
-Stabalizes scapula (pulls it inferiorly and anteriorly
against thoracic wall)
-Depresses and protracts the scapula
Supraspinatus: origin
Supraspinous Fossa
Supraspinatus: insertion
Upper facet of greater tubercle of humerus
Supraspinatus: innervation
Suprascapular Nerve (arises from upper trunk C5, 6)
Supraspinatus: action
1st 15 degrees of Abduction (then deltoid takes over)
Infraspinatus: origin
Infraspinous Fossa
Infraspinatus: insertion
Middle facet of the greater tubercle of humerus
Infraspinatus: innervation
Suprascapular Nerve (arises from upper trunk C5, 6)
Infraspinatus: action
Powerful lateral rotator
Teres minor: origin
lateral border of scapula
Teres minor: insertion
lower facet on greater tubercle of humerus
Teres minor: innervation
Axillary Nerve
Teres minor: action
Laterally rotates arm
Teres major: origin
Lateral border & inferior angle of scapula
Teres major: insertion
medial lip of bicipital groove of humerus
Teres major: innervation
Lower Subscapular Nerve
Teres major: action
Adducts and medially rotates the arm
Triceps brachii, long head: origin
Infraglenoid tubercle
Triceps brachii, lateral head: origin
Oblique line on posterior surface of humerus
Triceps brachii, medial head: origin
Posterior surface of humerus below the radial groove
Triceps brachii, all heads: insertion
Olecranon process (on ulna)
Triceps brachii, all heads: innervation
-Radial nerve.
-Long head of triceps gets its nerve supply while the radial nerve is in the axilla.
Coracobrachialis: origin
Coracoid process
Coracobrachialis: insertion
middle part of the medial border of humerus
Coracobrachialis: innervation
Musculocutaneous nerve
Biceps brachii, long head: origin
Supraglenoid tubercle
Biceps brachii, short head: origin
coracoid process of scapula
Biceps brachii, all heads: insertion
posteromedial aspect of radial tuberosity
Biceps brachii, all heads: action
Flexion of arm/forearm and supination of flexed elbow
Brachialis: origin
lower half of front of humerus
Brachialis: insertion
anterior surface of coronoid process and tuberosity of ulna
Brachialis: innervation
Musculocutaneous nerve & radial nerve
Brachialis: action
Flexor of forearm
Pronator teres: origin
medial epicondyle of humerus
Pronator teres: innervation
median nerve
Pronator teres: action
flexor of forearm
Palmaris longus: origin
medial epicondyle of humerus
Palmaris longus: innervation
median nerve
Palmaris longus: action
flexor of forearm
Flexor carpi radialis: origin
medial epicondyle of humerus
Flexor carpi radialis: innervation
median nerve
Flexor carpi radialis: action
flexor of forearm
Flexor carpi ulnaris: origin
medial epicondyle of humerus
Flexor carpi ulnaris: innervation
ulnar nerve
Flexor carpi ulnaris: action
flexor of forearm
Brachioradialis: origin
proximal two third of the lateral supracondylar ridge of the humerus
Brachioradialis: insertion
distal end of radius
Brachioradialis: innervation
Radial nerve
Brachioradialis: action
flexor of forearm
Flexor digitorum superficialis: origin
-Humeral head: Medial epicondyle of the humerus
-Radial head: Superior half of anterior border of radius
Flexor digitorum superficialis: insertion
Middle phalanges of medial four digits
Flexor digitorum superficialis: action
Flexes middle phalanges and metacarpophalangeal joint
Flexor digitorum superficialis: innervation
median nerve
Flexor digitorum profundus: origin
Proximal 3/4 of medial and anterior surfaces of ulna and interosseous membrane
Flexor digitorum profundus: insertion
Bases of distal phalanx of medial four fingers
Flexor digitorum profundus: innervation
Medial 1/2 by the ulnar nerve & lateral 1/2 by anterior interosseous nerve
Flexor digitorum profundus: action
Flexes distal phalanges in all four fingers & flexes metacarpophalangeal joints
Flexor pollicis longus: origin
Anterior surface of the radius and interosseous membrane
Flexor pollicis longus: insertion
Base of the distal phalanx of the thumb
Flexor pollicis longus: innervation
Anterior interosseous nerve
Flexor pollicis longus: action
Flexes phalanges of the first digit
Pronator quadratus: origin
Distal quarter of anterior surface of ulna
Pronator quadratus: insertion
Distal quarter of anterior surface of radius
Pronator quadratus: innervation
Anterior interosseous nerve
Pronator quadratus: action
Pronation of the forearms
Extensor digitorum: origin
lateral epicondyle of humerus
Extensor digitorum: insertion
Dorsal aspect of medial 4 digits
Extensor digitorum: innervation
posterior interosseous nerve
Extensor digiti minimi: origin
lateral epicondyle of humerus
Extensor digiti minimi: insertion
extensor expansion of the 5th finger
Extensor digiti minimi: innervation
posterior interosseous nerve
Extensor carpi ulnaris: origin
lateral epicondyle of humerus
Extensor carpi ulnaris: insertion
dorsal aspect of the base of the 5th metacarpal
Extensor carpi ulnaris: innervation
posterior interosseous nerve
Extensor Carpi radialis longus: origin
lateral supracondylar ridge of the humerus
Extensor Carpi radialis longus: insertion
dorsal aspect of the base of second metacarpal bone
Extensor Carpi radialis longus: innervation
radial nerve
Extensor carpi radialis brevis: origin
lateral epicondyle of humerus
Extensor carpi radialis brevis: insertion
Dorsal aspect base of the third metacarpal bone
Extensor carpi radialis brevis: innervation
Deep branch of radial nerve
Supinator: origin
Lateral epicondyle of humerus & radial collateral ligament, supinator crest of ulna
Supinator: insertion
lateral and anterior surface of the proximal third of radius
Supinator: innervation
Deep branch of the radial nerve
Supinator: action
Supinates forearm
Abductor pollicis longus: origin
Posterior surface of the proximal half of ulna
Abductor pollicis longus: insertion
Base of the first metacarpal bone
Abductor pollicis longus: innervation
Posterior interosseous nerve
Abductor pollicis longus: action
Abduction of the thumb
Extensor pollicis longus: origin
Posterior surface of the middle third of ulna
Extensor pollicis longus: insertion
Dorsal aspect base of the distal phalanx of thumb.
Extensor pollicis longus: innervation
Posterior interosseous nerve
Extensor pollicis brevis: origin
Posterior surface distal third of the radius
Extensor pollicis brevis: insertion
Dorsal aspect base of the proximal phalanx of the thumb
Extensor pollicis brevis: innervation
Posterior interosseous nerve
Extensor pollicis brevis: action
Extension of the proximal phalanx of the thumb
Extensor indicis: origin
Posterior surface of distal third of ulna
Extensor indicis: insertion
Extensor expansion of 2nd finger
Extensor indicis: innervation
Posterior interosseous nerve
Radial nerve
Extensor indicis: action
Extension of second finger
Palmaris brevis: innervation
Superficial branch of ulnar nerve