BIOD 151 EXAM 5 2026 STUDY GUIDE
COMPLETE QUESTIONS AND ANSWERS 100%
CORRECT
◉ Orbicularis oris. Answer: Action: mouth closure: closes lips,
protrudes lips forward, presses lips against teeth
Innervation: facial nerve (CN VII)
◉ Zygomaticus major/minor. Answer: Action: pull corners of lips
upward
Innervation: facial nerve (CN VII)
◉ Risorius. Answer: Action: pulls the corners of the mouth
posteriorly (grin or grimace)
Innervation: facial nerve (CN VII)
◉ Frontalis (occipitofrontailis). Answer: Action: raise eyebrows
Innervation: facial nerve (CN VII)
,◉ Buccinator. Answer: Action: compress cheeks
Innervation: facial nerve (CN VII)
◉ Masseter. Answer: Action: jaw closure
Innervation: trigeminal nerve (CN V, mandibular branch)
◉ Temporalis. Answer: Action: Elevates mandible, closes jaw
Innervation: trigeminal nerve (CN V, mandibular branch)
◉ lateral flexion. Answer: Side-bending left or right
◉ neck flexion. Answer: chin to chest
◉ bilateral. Answer: both sides
◉ unilateral. Answer: one-sided
◉ Semispinalis Capitis. Answer: Origin: articular processes of
inferior cervical & transverse process of superior thoracic vertebrae
,Insertion: occipital bone
Action: Bilateral extend head Unilateral laterally flexes neck to same
side
Innervation: spinal nerves
◉ Sternocleidomastoid. Answer: Origin: sternal end of clavicle and
manubrium
Insertion: mastoid region of skull
Action:Bilateral: neck flexionUnilateral: turns face to opposite side
Innervation: accessory nerve (CN XI)
◉ Splenius Capitis. Answer: Origin: spinous process AND ligaments
of inferior cervical vertebrae
Insertion: mastoid process, occipital bone of skull
, Action:Bilateral extend headUnilateral laterally flexes neck to same
side
Innervation: cervical spinal nerves
◉ Longissimus cervicis. Answer: Origin: transverse processes of
superior thoracic vertebrae
Insertion: transverse process of middle and superior cervical
vertebrae
Action:Bilateral extend headUnilateral laterally flexes neck to same
side
Innervation: cervical and thoracic spinal nerves
◉ Longissimus thoracis. Answer: Origin: transverse process of all
thoracic and lumbar vertebrae
Insertion: transverse processes of all thoracic vertebrae
Action:Bilateral extension of spineUnilaterally: lateral flexion of
spine
COMPLETE QUESTIONS AND ANSWERS 100%
CORRECT
◉ Orbicularis oris. Answer: Action: mouth closure: closes lips,
protrudes lips forward, presses lips against teeth
Innervation: facial nerve (CN VII)
◉ Zygomaticus major/minor. Answer: Action: pull corners of lips
upward
Innervation: facial nerve (CN VII)
◉ Risorius. Answer: Action: pulls the corners of the mouth
posteriorly (grin or grimace)
Innervation: facial nerve (CN VII)
◉ Frontalis (occipitofrontailis). Answer: Action: raise eyebrows
Innervation: facial nerve (CN VII)
,◉ Buccinator. Answer: Action: compress cheeks
Innervation: facial nerve (CN VII)
◉ Masseter. Answer: Action: jaw closure
Innervation: trigeminal nerve (CN V, mandibular branch)
◉ Temporalis. Answer: Action: Elevates mandible, closes jaw
Innervation: trigeminal nerve (CN V, mandibular branch)
◉ lateral flexion. Answer: Side-bending left or right
◉ neck flexion. Answer: chin to chest
◉ bilateral. Answer: both sides
◉ unilateral. Answer: one-sided
◉ Semispinalis Capitis. Answer: Origin: articular processes of
inferior cervical & transverse process of superior thoracic vertebrae
,Insertion: occipital bone
Action: Bilateral extend head Unilateral laterally flexes neck to same
side
Innervation: spinal nerves
◉ Sternocleidomastoid. Answer: Origin: sternal end of clavicle and
manubrium
Insertion: mastoid region of skull
Action:Bilateral: neck flexionUnilateral: turns face to opposite side
Innervation: accessory nerve (CN XI)
◉ Splenius Capitis. Answer: Origin: spinous process AND ligaments
of inferior cervical vertebrae
Insertion: mastoid process, occipital bone of skull
, Action:Bilateral extend headUnilateral laterally flexes neck to same
side
Innervation: cervical spinal nerves
◉ Longissimus cervicis. Answer: Origin: transverse processes of
superior thoracic vertebrae
Insertion: transverse process of middle and superior cervical
vertebrae
Action:Bilateral extend headUnilateral laterally flexes neck to same
side
Innervation: cervical and thoracic spinal nerves
◉ Longissimus thoracis. Answer: Origin: transverse process of all
thoracic and lumbar vertebrae
Insertion: transverse processes of all thoracic vertebrae
Action:Bilateral extension of spineUnilaterally: lateral flexion of
spine
