Head, Neck, and Trunk

Question 0

Masseter

Answer 0

Origin: Zygomatic arch
Insertion: ramus & angle of mandible
Action: closes mandible

Question 1

Sternocleidomastoid

Answer 1

Origin: sternum, clavicle
Insertion: mastoid process of the temporal
Action: rotates head, abducts & flexes head

Question 2

Obicularis Oris

Answer 2

Origin: Fascia of the facial muscles surrounding the mouth
Insertion: skin of the lips
Action: closes lips

Question 3

Obicularis oculi

Answer 3

Origin: Frontal & maxilla on medial margin of orbit
Insertion: skin of eyelid
Action: closes eyelid

Question 4

Internal intercostals

Answer 4

Origin: Superior border of the rib
Insertion: Inferior border of the rib
Action: depresses rib

Question 5

Temporalis

Answer 5

Origin: Temporal fossa
Insertion: ramus of mandible, coronoid process
Action: closes mandible

Question 6

External Intercostals

Answer 6

Origin: Inferior border of rib
Insertion: Superior border of rib
Action: elevates rib

Question 7

External abdominal oblique

Answer 7

Origin: ribs 5-12
Insertion: linea alba*, iliac crest, pubis
Action: compresses abdominal wall, laterally rotates trunk

Question 8

Diaphragm

Answer 8

Origin: Xiphoid process*, lower ribs, upper lumbar vertebrae
Insertion: central tendon
Action: Inspiration, expiration

Question 9

Rhomboideus major

Answer 9

Origin: spines of T 2-5
Insertion: lower 1/3 of vertebral border or scapula
Action: adducts scapula

Question 10

Scalenes

Answer 10

Origin: transverse process of cervical vertebrae
Insertion: ribs 1&2
Action: flexes and rotates neck, elevates ribs 1&2

Question 11

Serratus anterior

Answer 11

Origin: ribs 1-8
Insertion: vertebral border & inferior angle of scapula
Action: abducts scapula