Muscle Anatomy Quiz

What is the action of the frontal belly of the epicranius muscle?

• Pulls scalp posteriorly

• Raises eyebrows and wrinkles forehead skin horizontally

• Elevates the scapula

• Extends the head

Where does the trapezius muscle insert?

• Occipital bone

• Intertubercular sulcus

• Acromion, spine of scapula, clavicle

• Iliac crest

What is the origin of the latissimus dorsi muscle?

• SP of C7-T12

• SP of T6-12, ribs 9-12, iliac crest

• Acromion

• Occipital bone

What action is performed by the latissimus dorsi muscle?

• Raises eyebrows

• Pulls scalp posteriorly

• Extension, adduction, and medial rotation of humerus

• Elevation of scapula

What is the origin of the Sternocleidomastoid (SCM) muscle?

• Mastoid process of temporal bone

• Manubrium of sternum and medial clavicle

• Greater tubercle

• Axillary border of scapula

Which muscle assists the deltoid with shoulder abduction in the first 15 degrees?

• Infraspinatus

• Teres minor

• Supraspinatus

• Subscapularis

What is the action of the Infraspinatus muscle?

• Medial rotation of shoulder

• Lateral flexion

• Lateral rotation of shoulder

• Assists deltoid with shoulder abduction

Where does the Subscapularis muscle insert?

• Greater tubercle

• Lesser tubercle

• Mastoid process of temporal bone

• Axillary border of scapula

What is the origin of the Deltoid muscle?

• Clavicle, Ribs 1-7, Sternum

• Infraglenoid tubercle, Posterior and medial humerus

• Acromion, Spine of scapula, Clavicle

• Supraglenoid tubercle, Coracoid process

Which muscle is responsible for shoulder flexion, extension, medial rotation, lateral rotation, and abduction?

• Teres major

• Deltoid

• Pectoralis major

• Biceps brachii