Intrinsic muscles Flashcards
Deltoideus
O: Spine and acromial process of scapula
I: deltoid tuberosity
A: Flex the shoulder
I: Axillary nerve
Supraspinatus
O: Supraspinous fossa
I: Greater tubercle
A: extend and laterally stabilize shoulder joint
I: Suprascapular nerve
Infraspinatus
O: infraspinous fossa
I: Greater tubercle
A: extends shoulder
I: Suprascapular nerve
Suprascapularis
O: Subscapular fossa
I: lesser tubercle
A: to extend the elbow, stabilize the joint and to adduct the shoulder
I: Subscapular N
Teres major
O: cd. angle + border of scapula
I: teres major tuberosity
A: flex the shoulder; rotates shoulder medially; prevents lateral rotation (weight bearing)
I: Axillary nerve
Coracobrachialis
O: Coracoid process of scapula
I: crest of lesser tubercle
A: Adduct, extend and stabilize the shoulder joint
I: Muscolocutaneous nerve
Teres minor:
O: Infraglenoid tubercle
I: tere minor tuberosity
A: Flex shoulder joint, rotate shoulder laterally, prevents medial rotation
I: Axillary nerve
Biceps Brachii
O: supraglenoid tubercle
I: Ulnar and radial tuberostities
A: Flex the elbow, extend the shoulder
I: Musculocutaneous Nerve
Brachialis
O: proximal surface of the humerus
I: Ulnar and radial tuberostities
A: Flex the elbow
I: Musculocutaneous Nerve
Tensor Fasciae antebrachii
O: Fascia covering latissimus dorsi
I: Olecranon of the ulna
A: Extend the elbow
I: Radial Nerve
Triceps Brachii
O (Long Head): cd. scapula border
O (Lateral): Tricipital line of the humerus
O (Medial): crest of lesser tuberosity
O (accessory): neck of humerous
A: Extend the elbow joint
- Long head also flexs the shoulder joint
I: Radial nerve
Anconeus
O: The lateral supracondylar crest and the lateral and medial epicondyles of the humerus.
I: The lateral surface of the proximal end of the ulna (the olecranon).
A: To extend the elbow joint.
I: Radial nerve.
Pronator teres:
O: medial epicondyle of humerus
I: radius between proximal and middle thirds
A: to rotate the forearm medially so that the palmer side of the paw faces the ground
I: Median nerve
Pronator quadratus
apposed sides of the radius and ulna
A: pronation of the paw
I: Median nerve
Supinator
O: Lateral epicondyle of the humerus
i: cranial surface of the proximal fourth of the radius
A: To rotate the forearm laterally so that the palmar side of the paw faces medially
Extensor Carpi radialis
O: lateral epicondyle
(ECLU)
I: dorsal surface of base of MC II and III
A: extends the carpus
I: Radial Nerve
Common digital extensor
O: lateral epicondyle
(ECLU)
I: Extensor process of distal phalanges of digits II - v
A: extensor
I: Radial nerve
Lateral digital extensor
O: lateral epicondyle
(ECLU)
I: proximal ends of phalanges III, IV, V
A: extend the carpus and joints of digits III, IV, V
I: Radial nerve
Ulnaris Lateralis
O: lateral epicondyle
(ECLU)
I: proximal end of MC V and accessory carpal bone
A: traitor; FLEXOR but grouped with extensors
I: Radial Nerve
Superficial digital flexor (SDF)
O: medial epicondyle
I: Proximal end of the middle phalanges of digits II, III, IV, V
a: flexor
Deep digital flexor (DDF)
O: medial epicondyle
Flexor carpi radialis
O: medial epicondyle
I: Palmar side of the base of MC II and III
A: flexor of the capus
I: median nerve
Flexor carpi ulnaris
O: medial epicondyle
I: Accessory carpal bone
A: to flex the carpus
I: ulnar nerve
Abductor digiti 1 longus
lateral border and cranial surface of the body of the ulna
Proximal end of metacarpal I
Sternocephalicus
O: mastoid + occipital part: first sternebra
I: Mastoid - mastoid part of the temporal bone
Occiptal part: nuchal crest of the occipital part
