Midterm Practical

Question 1

Masseter

Answer 1

I: cranial nerve 5
O: maxilla and zygomatic arch
i: angle and ramus of mandible
A: elevates and protracts mandible, assists in lateral movement of mandible

Question 2

Temporalis

Answer 2

I: cranial nerve 5
O: temporal fossa - portions of the parietal, temporal, sphenoid, and frontal bones
I: coronoid process of mandible
A: elevates and retracts mandible, assists in lateral movement of mandible

Question 3

Platysma

Answer 3

I: facial nerve
O: subcutaneous tissue over thorax, down to 2nd intercostal space
I: mandible
A: depresses mandible, pulls corner of mouth downward

Question 4

Mylohyoid

Answer 4

I: cranial nerve 5
O: mandible
I: hyoid bone
A: elevates hyoid bone, depresses mandible

Question 5

Sternohyoid

Answer 5

I: ansa cervicalis
O: clavicle, manubrium of sternum
I: hyoid bone
A: depresses hyoid

Question 6

Sternocleidomastoid (SCM)

Answer 6

I: spinal accessory nerve
O: clavicle; manubrium of sternum
I: mastoid process
A: bilateral - flexion of cervical vertebral column, anterior motion of the head, elevation of the chin
unilateral - ipsilateral lateral flexion of the head, contralateral rotation of the head

Question 7

Scalenes

Answer 7

I: cervical nerves 3-8
O: transverse process of C2-7
I: 1st and 2nd ribs
A: bilateral - flexion of neck, elevation of 1st and 2nd ribs
unilateral - ipsilateral lateral flexion of neck, contralateral rotation of neck

Question 8

Trapezius

Answer 8

I: spinal accessory
Upper O: EOP, superior nuchal line, C7 spinous process
Upper I: lateral third of clavicle, acromion process
Upper A: elevates the scapula, upward rotation of scapula, extends head and neck, laterally flexes head and neck to side of contraction, rotates head and neck away from side of contraction

Middle O: spinous processes of T1-5
Middle I: spine of the scapula
Middle A: adduction and elevation of scapula

Lower O: spinous processes of T6-12
Lower I: spine of scapula
Lower A: depression, adduction, and upward rotation of the scapula

Question 9

Levator Scapula

Answer 9

I: dorsal scapular nerve
O: transverse processes of C1-5
I: superior angle of the scapula down along the superior medial border to the spine of the scapula
A: elevation and downward rotation of the scapula, lateral flexion of the head

Question 10

Splenius Cervicis

Answer 10

I: lower cervical nerves
O: spinous processes of T3-6
I: transverse processes of C1-4
A: bilateral - extension of head and neck
unilateral - ipsilateral lateral flexion of neck, ipsilateral rotation of head

Question 11

Splenius Capitis

Answer 11

I: middle cervical nerves
O: lower half of ligamentum nuchae, spinous processes of C7-T4
I: lateral 1/3 of superior nuchal line, mastoid process
A: bilateral - extension of head and neck
unilateral - ipsilateral lateral flexion of neck, ipsilateral rotation of head

Question 12

Semispinalis Capitis

Answer 12

I: cervical nerves
O: transverse processes of C7-T6, articular processes of C4-6
I: inferior to the superior nuchal line of the occiput
A: bilateral - extension of the neck and head
unilateral - ipsilateral lateral flexion of the neck and head, contralateral rotation of the head