2nd Order Quiz 1

function (what the muscle does - its action) • innervation (what nerve makes the muscle work) • Two different boney attachments (sometimes more than two bones) - usually when a muscle functions, the muscle attachment at one bone is stationary and the boney attachment at the other bone is on the bone that is moving

Superficial muscle of the back

Trapezius M

• function (what the muscle does - its action)

Superior Fibers: Elevate scapula; superiorly rotate scapula

Middle Fibers: Retract scapula

Inferior Fibers: Depress Scapula

• innervation (what nerve makes the muscle work)

Accessory Nerve (CN XI)

Latissimus Dorsi M

• function (what the muscle does - its action)

Agonist of arm extension; adducts arm

medially rotates arm

• innervation (what nerve makes the muscle work)

Thoracodorsal nerve (C6-C8)

Rhomboid Major M

• function (what the muscle does - its action)

Elevates scapula

Retracts (adducts) scapula

Inferiorly rotates scapula

• innervation (what nerve makes the muscle work)

Dorsal Scapular Nerve (C5)

Teres Minor M

• function (what the muscle does - its action)

Laterally rotates arm (agonist)

Adduction of arm

• innervation (what nerve makes the muscle work)

Axillary Nerve (C5-C6)

Supraspinatus M

• function (what the muscle does - its action)

Abducts Arm

• innervation (what nerve makes the muscle work)

Suprascapular Nerve (C5-C6)

Serratus Anterior M

• function (what the muscle does - its action)

Agonist in scapula protraction

Superiorly rotates scapula

Stabilizes scapula

• innervation (what nerve makes the muscle work)

Long Thoracic Nerve (C5-C7)

Subscapularis M

• function (what the muscle does - its action)

Medially rotates arm

• innervation (what nerve makes the muscle work)

Upper and Lower Subscapular nerves (C5-C6)

Splenius Capitis M

• function (what the muscle does - its action)

Rotation of head to same side (unilateral action)

Extension of neck (bilateral contraction)

• innervation (what nerve makes the muscle work)

Cervical spinal nerves

Gluteus Medius M

• function (what the muscle does - its action)

Abduction of thigh

Medially rotates thigh

• innervation (what nerve makes the muscle work)

Superior Gluteal Nerve (L4-S1)

Gluteus Maximus M

• function (what the muscle does - its action)

Extension of thigh

Laterally rotates thigh

• innervation (what nerve makes the muscle work)

Inferior Gluteal Nerve (L5-S2)

Rhomboid Minor M

structure

Levator Scapulae M

structure

Deltoid M

structure

define posterior border

Teres Major M

structure

Infraspinatus M

structure

Intermediate back muscles

Serratus Posterior Superior M

structure

Serratus Posterior Interior M

structure

Deep Muscles of the Back

Splenius Cervicis M

Iliocostalis M

iliocostalis lumborum M

thoracis M

cervicis M

Longissimus M

Longissimus thoracis M

cervicis M

capitis M

Spinalis M

Spinalis Thoracis M

cervicis M

capitis M

Semispinalis MM

Semispinalis thoracis M

cervicis M

Capitis M

Multifidus MM

Rotatores MM

Other Muscles of the Back

Interspinales M

Intertransversarii M

Levator Costarum M

Suboccipital Region

Oblique capitis superior M

Oblique Capitis Inferior M

Rectus Capitis Posterior Major M

Rectus Capitis Posterior Minor M

Greater Occipital N

Occipital A

Accessory N

The Spinal Cord

Ligamentum Flavum

Dura Mater

Arachnoid Membranes

Denticulate Ligaments

Spinal Ganglion/ Dorsal Root Ganglion

Spinal N

Dorsal Roots

Ventral Roots

Conus Medullaris

Cauda Equina

Filum Terminale

Gluteal Region

Piriformis M

Superior gluteal AA, VV, and NN

Gluteus Minimus M

Sciatic N

Inferior Gluteal AA, VV, and NN

Superior Gemellus M

Obturator Internus M

Inferior Gemellus M

Quadratus Femoris M