Head And Neck

Question 1

What is the origin of the masseter

Answer 1

Facial crest

Question 2

Insertion for masseter

Answer 2

Large area caudolateral on mandible

Question 3

Action for masseter

Answer 3

Mastication

Question 4

Innervation of masseter

Answer 4

Masticatory nerve, a branch of the mandibular nerve

Question 5

Origin of Rectus Capitus Dorsalis Major/ Minor

Answer 5

(major) spinous process of axis
(minor) dorsal arch of atlas

Question 6

Insertion for Rectus Capitus Dorsalis Major/Minor

Answer 6

Major: Nuchal crest
Minor: Occipital bone

Question 7

Action for Rectus Capitus Dorsalis Major/Minor

Answer 7

Both: Elevates head

Question 8

Innervation for Rectus Capitus Dorsalis Major/Minor

Answer 8

Dorsal branch of C1

Question 9

Origin for Oblique Capital Cranial

Answer 9

Ventral surface of wing of atlas

Question 10

Insertion of Oblique Capital Cranial

Answer 10

Nuchal crest and mastoid process of temporal bone

Question 11

Action of Oblique Capital Cranial

Answer 11

Extends head, flexes it laterally

Question 12

Innervation of Oblique Capital Cranial

Answer 12

Dorsal branch of C1

Question 13

Origin of splenius

Answer 13

Spinous processes of T3-5 by means of thoracolumbar fascia; nuchal ligament

Question 14

Insertion of splenius

Answer 14

Nuchal crest and mastoid process of temporal bone; transv. Processes of C2-5

Question 15

Action of splenius

Answer 15

Extends, elevates, or bends neck and head laterally

Question 16

Innervation of splenius

Answer 16

Dorsal brr. of local spinal nn., and dorsal br. Of accessory n.

Question 17

Origin of trapezius

Answer 17

Nuchal and supraspinous ligaments from C2-10

Question 18

Insertion of trapezius

Answer 18

Thoracic part: dorsal third of scapular spine
Cervical part: entire scapular spine

Question 19

Action of trapezius

Answer 19

Elevates shoulder: draws scapula craniodorsally and caudodorsally

Question 20

Innervation of trapezius

Answer 20

Dorsal branch of the accessory nerve

Question 21

Origin of sternocephalicus

Answer 21

Manubrium sterni

Question 22

Insertion of sternocephalicus

Answer 22

Caudal border of mandible

Question 23

Action of sternocephalicus

Answer 23

Opens mouth; flexes or inclines head and neck to the side of the muscle

Question 24

Innervation of sternocephalicus

Answer 24

Ventral branch of the accessory nerve (XI)

Question 25

Origin of rhomboideus

Answer 25

Nuchal and dorsoscapular ligaments from C2 to T8

Question 26

Insertion of rhomboideus

Answer 26

Scapular cartilage

Question 27

Action of rhomboideus

Answer 27

Draws scapula dorsally and cranially; elevates neck

Question 28

Innervation of rhomboideus

Answer 28

Ventral branches of cervical nerves

Question 29

Origin of serratus

Answer 29

Thoracic: first 8 or 9 ribs
Cervical: transverse process of C4-7

Question 30

Insertion of serratus

Answer 30

Scapular cartilage and two adjacent triangular areas on medial surface of scapula

Question 31

Action of serratus

Answer 31

Suspends trunk; raises neck when forelimb is fixed; may support inspiration

Question 32

Innervation of serratus

Answer 32

Thoracic: long thoracic nerve
Cervical: ventral branches of local cervical nerves