Muscle Innervations
This cranial nerve innervates the trapezius muscle
Spinal Accessory N. (CN XI)
The trapezius originates from the external occipital protuberance and which vertebrae?
C7-T12 spinous processes
The levator scapulae inserts on which part of the scapula?
Medial border of the scapula
The supraspinatus initiates which shoulder movement?
Abduction
This nerve innervates the serratus anterior and if damaged causes a "winged scapula"
Long thoracic nerve
The latissimus dorsi originates from the thoracolumbar fascia and which vertebral levels?
T7-L5
The deltoid inserts on which bony landmark of the humerus?
Deltoid tuberosity of the humerus
Damage to the axillary nerve would most affect which motion?
The musculocutaneous n. supplies which two major flexor muscles of the arm?
Biceps brachii and Brachialis
The short head of the biceps brachii originates from this part of the scapula.
Coracoid process
The pectoralis major inserts on which part of the humerus?
Lateral lip of the intertubercular groove
The pronator teres is responsible for what action at the forearm?
Pronation
What nerve innervates all the muscles in the posterior compartment of the arm and forearm?
Radial Nerve
The supraspinatus and infraspinatus both originate on fossae of which bone?
Scapula
The biceps brachii inserts into which bone and landmark?
radial tuberosity of the radius
The triceps brachii performs which action at the elbow?
Extension
The recurrent branch of this nerve supplies the thenar muscles responsible for thumb opposition.
Median Nerve
The flexor carpi ulnaris originates from which part of the humerus?
Medial epicondyle
The trapezius has three parts that insert on different landmarks--name all three.
Lateral third of clavicle, acromion, and spine of scapula
Injury to the radial nerve in the spiral groove of the humerus results in weakness of wrist and finger extension. What is this condition commonly called?
Wrist drop