Muscle Lab 1 or 2 Answer Key to Origins, Insertions, and Primary Actions of Selected Muscles Revised F PDF

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Download Muscle Lab 1 or 2 Answer Key to Origins, Insertions, and Primary Actions of Selected Muscles Revised F PDF

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Origins and Insertions of Selected Muscles

3. Complete the table below by providing the origin and insertion of the selected muscles.

Muscle

Origin

Insertion

masseter

zygomatic arch

coronoid process, angle, and lateral surface of the mandible

sternocleidomastoid

manubrium of the sternum and sternal end of the clavicle

mastoid process of the temporal bone

deltoid

acromial end of the clavicle and acromion and spine of the scapula

deltoid tuberosity of the humerus

supraspinatus

supraspinous fossa of the scapula

greater tubercle of the humerus

biceps brachii short head

coracoid process of the scapula

radial tuberosity of the radius

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Primary Actions of Muscles 4. Complete the tables below and on the next page by providing one primary action for the muscles or group of muscles listed. Name of Muscle or Muscle Group

Primary Action of Muscle

frontal belly of occipitofrontalis muscle

raises eyebrows; wrinkles skin of forehead

occipital belly of occipitofrontalis muscle

slightly retracts scalp

orbicularis oculi muscle

closes eye (as in winking, blinking, and squinting)

orbicularis oris muscle

compresses and purses lips

masseter muscle

elevation and protraction of mandible

temporalis muscle

elevation and retraction of mandible

sternocleidomastoid muscle

bilateral action (BLA) – flexion of neck unilateral action (ULA) – lateral flexion of head

erector spinae muscle group

extension of neck and vertebral column (BLA)

external oblique muscle internal oblique muscle transversus abdominis muscle

flexion (BLA) and lateral flexion (ULA ) of vertebral column flexion (BLA) and lateral flexion (ULA ) of vertebral column flexion (BLA) and lateral flexion (ULA ) of vertebral column

rectus abdominis muscle

flexion of vertebral column

pectoralis minor muscle

protraction and depression of scapula

serratus anterior muscle

protraction of scapula

levator scapulae muscle

elevation of scapula

rhomboid major muscle

elevation and retraction of scapula

rhomboid minor muscle

elevation and retraction of scapula

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Name of Muscle or Muscle Group

Primary Action of Muscle

trapezius muscle

superior fibers – elevation of scapula; middle fibers – retraction of scapula; inferior fibers – depression of scapula

latissimus dorsi muscle

extension of arm; also adduction and medial rotation of arm

pectoralis major muscle

flexion of arm; also adduction and medial rotation of arm

deltoid muscle

middle fibers – abduction of arm; anterior fibers – flexion and medial rotation of arm; posterior fibers – extension and lateral rotation of arm

coracobrachialis muscle

adduction and flexion of arm

teres major muscle

extension, adduction, and medial rotation of arm

subscapularis muscle

medial rotation of arm

supraspinatus muscle

abduction of arm

infraspinatus muscle

adduction and lateral rotation of arm

teres minor muscle

adduction and lateral rotation of arm

biceps brachii muscle

flexion and supination of forearm

brachialis muscle

flexion of forearm

brachioradialis muscle

flexion of forearm

triceps brachii muscle

extension of arm; also adduction of arm by long head

pronator teres muscle

pronation of forearm

pronator quadratus muscle

pronation of forearm

supinator muscle

supination of forearm

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