Exam 4 OIIAs

anterior scalene attachments

O: anterior tubercles of TPs of C3-C6, I: first rib

anterior scalene actions

forced inspiration and elevation of first rib

anterior scalene innervation

cervical spinal nerves C4-C6

middle scalene attachments

O: posterior tubercles of TPs C4-C7, I: superior surface of first rib and posterior groove for subclavian artery

middle scalene actions

lateral flexion of neck, elevation of first rib, forced inspiration

middle scalene innervation

ventral rami of cervical spinal nerves

posterior scalene attachments

O: posterior tubercles of TPs C4-C6, I: external border of second rib

posterior scalene actions

lateral flexion of neck, elevation of second rib, forced inspiration

posterior scalene innervation

ventral rami of cervical spinal nerves C7, C8

temporalis attachments

O: floor of temporal fossa, deep surface of temporalis fascia; I: tip and medial surface of coronoid process, anterior border of ramus of mandible

temporalis actions

elevation of mandible, closing of jaw, posterior: retraction of mandible

temporalis innervation

CN 5 via deep temporal nerves

masseter attachments

O: quadrate muscle, I: angle and lateral surface of ramus of mandible

masseter actions

elevation of mandible, superficial: help protrude mandible

masseter innervation

CN 5 via masseteric nerve

lateral pterygoid attachments

O: infratemporal surface and crest of greater wing of sphenoid, lateral surface of pterygoid plate; I: joint capsule and disc of TMJ, pterygoid fovea on condyloid process of mandible

lateral pterygoid actions

bilateral: protraction of mandible and depression of chin, unilateral: swing jaw to contralateral side

lateral pterygoid innervation

CN 5 via nerve to lateral pterygoid

medial pterygoid attachments

O: medial surface of pterygoid plate, tuberosity of maxilla; I: medial surface of ramus of mandible, inferior to mandibular foramen

medial pterygoid actions

elevation of mandible, protrusion of jaw

medial pterygoid innervation

CN 5 via nerve to medial pterygoid

SCM attachments

O: mastoid process, temporal bone, lateral ½ of superior nuchal line; I: anterior surface of manubrium, medial 1/3 of clavicle

SCM actions

unilateral: lateral flexion and contralateral rotation of neck; bilateral: extension of neck, flexion of cervical vertebrae, keeps head level

SCM innervation

spinal accessory nerve (CN 11)

intercostal muscles actions/innervation

action: moves ribs for breathing, innervation: intercostal nerves

respiratory diaphragm actions/innervation

action: respiration, innervation: phrenic nerve (C3-C5)

infrahyoid muscle actions/innervation

action: move mouth and larynx when talking and swallowing, innervation: cervical plexus

longus capitis and coli actions/innervation

action: flexion of neck, innervation: cervical plexus