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Final exam info

Terms in this set (36)

Orbicularis Oris
IN: Facial nerve (CN VII) via buccal branch
A: Phasic contraction compresses and protrudes lips (kissing) or resists distension (blowing)
Depressor Anguli Oris
IN: Facial nerve (CN VII) via mandibular branch
A: Part of dilators of mouth; depresses labial commissure bilaterally to frown (sadness)
Levator Labii Superioris
IN: Facial nerve (CN VII) via buccal branch
A: Elevate and/or evert upper lip; deepen nasolabial sulcus (showing sadness)
Levator Anguli Oris
IN: Facial nerve (CN VII) via buccal branch
A: Part of dialators of mouth; elevate labial commissure
-Bilaterally to smile (happiness) and unilaterally to sneer (disdain)
Buccinator
IN: Facial nerve (CN VII) via buccal branch
A: Presses cheek against molar teeth; works with tongue to keep food between occlusal surfacesand out of oral vestibule; resists distension (when blowing)
Orbicularis Oculi
IN: Facial nerve (CN VII) via temporal and zygomatic branches
A: Closes eyelids; palpebral part does so gently; orbital part does so tightly (winking)
Platysma
IN: Cervical branch of facial nerve (CN VII)
A: Draws the corner of
mouth inferiorly and widens it
(sadness and fright); draws skin of neck superiorly when teeth are clenched
Sternohyoid
IN: C1-C3 by a branch of ansa cervicalis
A: Depresses hyoid after elevation during swallowing
Omohyoid
IN: C1-C3 by a branch of ansa cervicalis
A: Depresses, retracts, and steadies the hyoid
Sternothyroid
IN: C2 and C3 by a branch of ansa cervicalis
A: Depress hyoid and larynx
Thyrohyoid
IN: C1 via hypoglossal nerve (CN XII)
A: Depresses hyoid and elevates larynx
Anterior Digastric
IN: Nerve to mylohyoid, a branch of inferior alveolar nerve
A: Working with infrahyoid muscles:
- depresses mandible against resistance
-elevates and steadies hyoid during swallowing and speaking
Posterior Digastric
IN: Digastric branch of facial nerve (CN VII)
A: Working with infrahyoid muscles:
-depresses mandible against resistance
-elevates & steadies hyoid during swallowing & speaking
Mylohyoid
IN: Nerve to mylohyoid, a branch of inferior alveolar nerve (from mandibular nerve, CN V3)
A: Elevates hyoid, floor of mouth, and tongue during speaking and swallowing
Stylohyoid
IN: Stylohyoid branch of facial nerve (CN VII)
A: Elevates and retracts hyoid, thus elongating floor of mouth
Sternocleidomastoid
O: Mastoid process of temporal bone and lateral half of superior nuchal line
I: Sternal head: manubrium of sternum
Clavicular head: medial third of clavicle
IN: Spinal accessory nerve (CN XI, motor); C2 & C3 nerves (pain and propioception)
A: -Unilaterally: ipsilat laterally bends and contralat rotates head and neck
-Bilaterally: protrudes head and neck
-Elevates sternum during forceful inspiration
Anterior Scalene
O: Transverse Processes of C3-C6
I: 1st rib
IN: Ventral rami C4-C6 spinal nerves
A: -Laterally flex head and neck to same side
-Elevate first rib during forced inspiration
Middle Scalene
O: Posterior tubercles of transverse processes of C2-C7
I: 1st rib
IN: Ventral rami C3-C8 spinal nerves
A: -Laterally flex head and neck to same side
-Elevate first rib during forced inspiration
Posterior Scalene
O: Posterior tubercles of transverse processes of C2-C7
I: External border of 2nd rib
IN: Ventral rami of C7-C8 rami spinal nerves
A: -Laterally flex head and neck
-Elevate 2nd rib during forced inspiration
Rectus Capitis Anterior
IN: Branches from the loop between C1 and C2 spinal nerves
A: Flex head
Rectus Capitis Lateralis
IN: Branches from the loop between C1 and C2 spinal nerves
A: Flex head and help stabilize it
Longus Colli
IN: Ventral rami of C2-C6 spinal nerves
A: -flexes neck acting bilaterally
-contra lateral rotation acting unilaterally
Longus Capitis
IN: Ventral rami of C1-C3 spinal nerves
A: Flex head
Masseter
IN: Anterior trunk of mandibular nerve (CN V3) via masseteric nerve
A: -Elevates mandible thus closing the jaw
-Superficial fibers make a limited contribution to protrusion of mandible
Temporalis
IN: Anterior trunk of mandibular nerve (CN V3) via deep temporal branches
A: -Elevates mandible thus closing the jaw
-Horizontal (posterior) fibers are primary retractors of mandible
Medial Pterygoid
IN: Anterior trunk of mandibular nerve (CN V3) via medial pterygoid nerve
A: -Acts synergistically with masseter to elevate mandible
-Contributes to protrusion
-Alternate unilateral activitiy produces smaller grinding movements
Lateral Pterygoid
IN: Anterior trunk of mandibular nerve (CN V3) via lateral pterygoid nerve
A:
Acting bilaterally: protracts mandible and depresses chin
Acting unilaterally: swings jaw toward contralateral side; alternate unilateral contraction produces larger lateral chewing movements
External intercostal
IN: Intercostal nerve
A: Elevate ribs during forced inspiration
Internal intercostal
IN: Intercostal nerve
A: Interosseous part: depress ribs during forced respiration
Interchondral part: elevate ribs during forced respiration
Innermost Intercostal
IN: Intercostal nerve
A: Interosseous part: depress ribs during forced respiration
Interchondral part: elevates ribs during forced respiration
Transversus Thoracis
IN: intercostal nerve
A: Weakly depresses ribs
External Oblique
O: external surfaces of the 5-12th ribs
I: Linea alba; pubic tubercle; anterior half of the iliac crest
IN: Thoracoabdominal nerves (T7-T11 spinal nerves) and subcostal nerve
A: -Bilaterally: flexes trunk
-Unilaterally: rotates trunk contralaterally
-Compresses abdominal viscera
Internal Oblique
O: Thoracolumbar fascia; anterior 2/3 of the iliac crest; lateral 2/3 of the inguinal ligament
I: Inferior borders of the 10th-12th ribs; linea alba; pecten pubis via the conjoint tendon
IN: Thoracoabdominal nerves (ventral rami of T6-T12 spinal nerves) and first lumbar nerves
A: -Bilaterally: flexes trunk
-Unilaterally: rotates trunk ipsilaterally
-Compresses abdominal viscera
Transverse Abdominus
O: Internal surfaces of 7th-12th costal cartilages; thoracolumbar fascia; iliac crest; lateral third of inguinal ligament
I: Linea alba with the aponeurosis of the internal oblique; pubic crest; pecten pubis via the conjoint tendon
IN: Thoracoabdominal nerves (ventral rami of T6-T12 spinal nerves) first lumbar nerves
A: Compresses and supports abdominal viscera
Rectus Abdominis
O: pubic symphysis and pubic crest
I: Xiphoid process and the 5-7th costal cartilages
IN: Thoracoabdominal nerves (ventral rami of T6-T12 spinal nerves)
A: -Flexes trunk (lumbar vertebrae) and compresses the abdominal viscera
- Stabilizes and posteriorly tilts pelvis
Quadratus Lumborum
O: Medial half of the inferior border of the 12th rib and the tips of the lumbar TPs
I: Iliolumbar ligament and the internal lip of the iliac crest
IN: Ventral rami of T12-L4
A: -Extends and laterally flexes vertebral column
-fixes 12th ribs during inspiration
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