Muscles Head, Neck, and Trunk

Question 1

Buccinator

Answer 1

A: Compresses cheek, pulls corner of mouth laterally

• whistling
• mastication

Question 2

Orbicularis oris

Answer 2

A: Closes and protrudes lips

Question 3

Orbicularis oculi

Answer 3

A: Closes eyelids

Question 4

Platysma

Answer 4

O: Skin & fascia of shoulder & upper chest
I: Mandible, skin near lips, & corner of mouth
A: depresses mandible, draws corners of mouth downward

Question 5

Temporalis

Answer 5

O: Temporal fossa, temporal aponeurosis
I: coronoid process of the mandible
A: elevates and retracts mandible

Question 6

Masseter

Answer 6

O: Zygomatic arch
I: Angle & ramus of the mandible
A: elevates mandible

Question 7

Lateral pterygoid

Answer 7

O: ateral surface of lateral pterygoid plate
I: anterior surface of the condyloid process & the capsule of the joint
A: protraction and depression of lower jaw

Question 8

Medial pterygoid

Answer 8

O: medial surface of lateral pterygoid plate
I: internal surface of angle of mandible
A: elevates & protracts mandible

Question 9

Stylohyoid

Answer 9

O: styloid process of temporal bone
I: Hyoid bone
A: draws hyoid posteriorly

Question 10

Omohyoid

Answer 10

O: superior border of the scapula
I: hyoid bone
A depresses hyoid, draws it posteriorly

Question 11

Sternohyoid

Answer 11

O: manubrium of the sternum (and medial clavicle)
I: body to the hyoid
A: depresses hyoid

Question 12

Sternothyroid

Answer 12

O: manubrium of the sternum
I: Thyroid cartilage
A: depresses thyroid

Question 13

Thyrohyoid

Answer 13

O: Thyroid cartilage (larynx)
I: hyoid bone
A: depresses hyoid & elevates thyroid cartilage

Question 14

Scaleni:
Scalenus anterior
Scalenus medius
Scalenus posterior

Answer 14

O: transverse process of C2-C6
I: first and second ribs
A: elevate ribs

Question 15

Semispinalis capitis

Answer 15

O: transverse process of T1-T6
I: between the superior & inferior nuchal lines
A: extends the head

Question 16

Splenius capitis

Answer 16

O: spinous process of the lower cervical & upper thoracic vertibrae
I: mastoid process, lateral superior nuchal line
A: both: extend head
Individual: turn face to the same side

Question 17

External intercostals

Answer 17

A: elevate ribs in inspiration

Question 18

Internal intercostals

Answer 18

A: depresses ribs in expiration

Question 19

External oblique

Answer 19

O: external surface of ribs 5-12
I: linea alba, iliac crest
A: compresses abdomen, flexes & rotates trunk

Question 20

Internal oblique

Answer 20

O: thoracolumbar aponeurosis, iliac crest
I: linea alba, inferior border of ribs 10-12
A: compresses abdomen, flexes & rotates trunk

Question 21

Transverse abdominis

Answer 21

O: ribs 7-12, thoracolumbar aponeurosis, iliac crest
I: linea alba
A: compresses abdomen

Question 22

Rectus abdominis

Answer 22

O: pubic symphysis
I: xiphoid process & costal cartilages of ribs 5-7
A: compress abdomen; flexes trunk; depresses ribs

Question 23

Diaphragm

Answer 23

O: xiphoid process, ribs 7-12, costal cartilages
I: central tendon
A: expands thoracic cavity, compresses abdominopelvic cavity

Question 24

1) Iliocostalis
2) Longissimus
3) Spinalis

Answer 24

A: Chief extensors of the vertebral column

Question 25

Quadratis lumborum

Answer 25

A: lateral flexion of the vertebral column; depresses ribs