All muscles of facial expression are innervated by Answer-facial nerve (CN VII)
Medial and Lateral Pterygoids Answer-O: sphenoid bone
I: mandible and condylar process of mandible
, Oakland University BIO2100 Chris Kauhn Exam
2; Questions & Answers 100% Verified
A: grinding movement
IN: mandibular branch
Sternocleidomastoid Answer-O: manubrium of sternum
I: mastoid process
A: flexion of the head
IN: CN XI
Trapezius Answer-Origin: Skull, cervical and thoracic vertebrae
Insertion: Clavicle, acromion, spine of scapula
Action: Upward rotation, elevation and depression of the scapula
Innervation: (CN XI) Accessory nerve
Deltoid Answer-Origin: spine of the scapula, acromion, clavicle
Insertion: deltoid tuberosity of the humerus
Action: flexion, extension, abduction medial and lateral rotation of the arm at the shoulder joint
Innervation: Axillary nerve
Pectoralis Major Answer-Origin:
Clavicular part- medial half of the clavicle
Sternocostal part- sternum and first 6 costal cartilages
Insertion: Crest of greater tubercle of humerus
Action: adduction, medial rotation and flexion of the arm at the shoulder joint
Innervation: medial and lateral pectoral nerves
Pectoralis Minor Answer-Origin: Ribs 2-5
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