Origins, Insertions, and Actions

Question 1

• attachment point of the muscle that does not move during muscular contraction

Answer 1

origin

Question 2

• attachment that moves during contraction

Answer 2

insertion

Question 3

effect the muscle has on a part of the body

Answer 3

action

Question 4

Masseter

Answer 4

• Zygomatic bone (O)
• Mandibular Angle (I)
• Elevates mandible (A)

Question 5

Temporalis

Answer 5

• Temporal bone (O)
• Coronoid Process of Mandible (I)
• Elevates mandible (A)

Question 6

Digastric

Answer 6

• Inferior mandible (O)
• Hyoid bone (I)
• depresses mandible (A)

Question 7

Sternocleidomastoid

Answer 7

• Manubrium and Medial Clavicle (O)
• Mastoid process of temporal bone (I)
• Head and Neck movements

Question 8

Rectus Abdominis

Answer 8

• Pubic Symphysis (O)
• Xiphoid Process, Coastal Cartilage (I)
• Flexes vertebral column, compresses abdomen (A)

Question 9

Trapezius

Answer 9

• Occipital bone, dorsal spinous processes (O)
• Clavicle, scapula (I)
• Extends head; elevates scapula (A)

Question 10

Latissimus Dorsi

Answer 10

• Dorsal spine, iliac crest (O)
• Close to head of humerus (I)
• Extends arm; adducts and medially rotates arm

Question 11

Rhomboids (major and minor)

Answer 11

• Dorsal spinous processes of C7-T5 (O)
• Medial border of scapula (I)
• Adducts scapula (A)

Question 12

Deltoids

Answer 12

• clavicle, acromion process, spine of scapula (O)
• Deltoid tuberosity of humerus (I)
• Abducts arm (A)

Question 13

Triceps Brachii

Answer 13

• Scapula and humerus (O)
• Olecranon process of ulna (I)
• Extends forearm (A)

Question 14

Pectoralis major

Answer 14

• Clavicle, sternum, coastal cartilage (O)
• Greater tubercle of humerus (I)
• Arm movements (A)

Question 15

Biceps brachii

Answer 15

• Coracoid process/supraglenoid tubercle of scapula (O)
• radial tuberosity (I)
• flexes forearm (A)

Question 16

iliopsoas

Answer 16

• transverse processes of T12-L5 (O)
• lesser trochanter of femur (I)
• major flexor of thigh (A)

Question 17

Sartorius

Answer 17

• Anterior superior iliac spine (O)
• Tibia condyle (I)
• flexes and laterally rotates thigh

Question 18

Quadriceps femoris muscles

Answer 18

• ilium (rectus femoris) and femur
• tibial tuberosity (I)
• Extends leg (A)

Question 19

hamstrings

Answer 19

• ischial tuberosity
• head of fibula, tibia condyles (I)
• extends thigh, flexes leg (A)

Question 20

Gluteus maximus

Answer 20

• iliac crest, sacrum, coccyx
• Gluteal tuberosity (I)
• Extends thigh (A)

Question 21

Tibialis anterior

Answer 21

• lateral condyle
• metatarsal 1
• dorsiflexion (A) - points toe upward

Question 22

gastrocnemius

Answer 22

• condyles of femur
• calcaneus (I)
• Plantar flexes (extends) foot (A)