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Thoracic Limb - INT

Intrinsic muscles of the pectoral/thoracic limb

QuestionAnswer
Deltoideus ORIGIN - scapula spine and ventral side acromion process INSERTION - deltoid tuberosity ACTION - flexion of shoulder FORM - short mm. 2 parts Scapular head and acromial head POSITION - superficial to infraspinatus
Supraspinatus ORIGIN - suprasinous fossa scapula INSERTION - greater tubercle humerus ACTION - extension and stability of shoulder
Infraspinatus ORIGIN - infraspinous fossa scapula INSERTION - lateral aspect greater tubercle humerus ACTION - flexion, stability and lateral rotation of shoulder POSITION - deep to deltoideus
Teres minor ORIGIN - infraglenoid tubercle and caudal scapula border INSERTION - teres minor tuberosity humerus ACTION - flexion and lateral rotation of shoulder POSITION - ventral to infraspinatus
Triceps brachii - long head ORIGIN - caudal border of scapula INSERTION - olecranon process ACTION - flexion of shoulder
Triceps brachii - lateral head ORIGIN - caudal aspect of proximal humerus (tricipital line) INSERTION - olecranon process ACTION - extension of elbow
Triceps brachii - accessory head ORIGIN - neck of humerus INSERTION - olecranon process ACTION - extension of elbow
Triceps brachii - medial head ORIGIN - lesser tubercle humerus INSERTION - olecranon process ACTION - extension of elbow
Brachialis ORIGIN - proximal third of lateral humerus INSERTION - radial tuberosity, ulnar tuberosity ACTION - flexion of elbow POSITION - deep to biceps brachii, lies on humerus
Anconeus ORIGIN - medial and lateral epicondyles humerus INSERTION - lateral proximal ulna ACTION - extension of elbow POSITION - fills olecranon fossa, deep muscle
Subscapularis ORIGIN - subscapular fossa INSERTION - lesser tubercle humerus ACTION - adduction, extension and stability of shoulder POSITION - lie on medial face of scapula
Teres major ORIGIN - caudal border of scapula INSERTION - teres major tuberosity humerus ACTION - flexion of shoulder
Coracobrachialis ORIGIN - coracoid process scapula INSERTION - lesser tubercle ACTION - extension and adduction of shoulder FORM - small mm. long tendon of origin
Biceps brachii ORIGIN - supraglenoid tubercle scapula INSERTION - ulna and radial tuberosities ACTION - extension of shoulder, flexion of elbow FORM - 1 m. belly, 2 tendons of insertion
Tensor fasciae antebrachii ORIGIN - fascia of latissimus dorsi INSERTION - olecranon of ulna ACTION - extension of elbow FORM - thin, flat m. POSITION - superficial to triceps long head, connecting to aponeurosis of antebrachii
Created by: tazza261
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