gen ana lab muscle pt 2

Occipitalis

moves scalp posteriorly

Frontalis

moves scalp anteriorly; raises eyebrows

Galea Aponeurotica

aponeurosis in the head; connects Occipitalis and Frontalis

Orbicularis oculi

closes eyes

Corrugator supercilii

moves eyebrows inferiorly, wrinkles forehead; involved in FROWNING

Superior oblique

moves eyeballs INFERIORLY and LATERALLY

Lateral rectus

moves eyeballs LATERALLY

Superior rectus

moves eyeballs SUPERIORLY

Inferior rectus

moves eyeballs INFERIORLY

Medial rectus

moves eyeballs MEDIALLY

Inferior oblique

moves eyeballs SUPERIORLY and LATERALLY

Levator palpebrae superioris

elevates eyelids/opens eyes

Nasalis

compresses and dilates the nostril

Procerus

depresses the medial eyebrow angle; producing a transverse fold across the glabella

Orbicularis oris

closes lips; kissing, pouting

Zygomaticus major

elevates upper lip

Zygomaticus minor

elevates upper lip

Levator anguli oris

“Caninus muscle”; elevates angle of the mouth

Levator labii superioris ala que nasi

elevates upper lip

Levator labii superioris

elevates upper lip

Depressor labii inferioris

depresses lower lip

Depressor anguli oris

depresses angle of the mouth

Buccinator

presses cheeks; whistling, blowing; keeps food away from vestibular area

Risorius

moves angle of mouth laterally; fake or sardonic smile

Mentalis

protrudes lower lip; causes wrinkling of skin

Platysma

depresses lower lip and mandible

Sternocleidomastoid muscle

flexion, extension, and rotation of the head

Suprahyoid Muscles

mainly DEPRESSES mandible, and ELEVATES HYOID

Infrahyoid Muscles

DEPRESSES hyoid

Muscles of the Back

group of paired muscles that lie on the posterior aspect of the trunk; provide movements of the spine, stability to the trunk, and coordination between movements of the limbs and trunk

Superficial Muscles of the Back

immigrant muscles of the upper limb that lie superficially in the back

trapezius/latissimus dorsi/levator scapulae/rhomboid major/rhomboid minor

muscles of the Superficial layer of the Superficial Muscles of the Back

Serratus posterior superior/serratus posterior inferior

muscle of the intermediate layer of the Superficial Muscles of the Back

deep muscle of the back

true muscles of the back that lie deep to the thoracolumbar fascia act together to help maintain the body’s posture and move the vertebral column.

splenius muscles/erector spinae muscles

these are the superficial layer muscles of the deep muscles of the back

semispinalis/mutlifidus/rotatores

these are the deep layer muscles of the deep muscles of the back

interspinales/intertransversarii

these are the deepest layer muscles of the deep muscles of the back

Splenius muscles

rotates, laterally flexes, and extends the neck

Splenius capitis muscle/Splenius cervicis muscle

the two Splenius muscles are

Erector Spinae

a massive muscle group that extends (bilateral contraction) and laterally flexes the spine (unilateral contraction)

Spinalis muscle

spinalis capitis, spinalis cervicis, spinalis thoracis

Longissimus muscle

longissimus capitis, longissimus cervicis, longissimus thoracis

Iliocostalis muscle

iliocostalis cervicis, iliocostalis thoracis, iliocostalis lumborum

Transversus abdominis muscle/Internal abdominal oblique muscle/Rectus abdominis muscle/External abdominal oblique muscle/Pyramidalis muscle

anterolateral abdominal wall muscles are

Psoas major muscle/Iliacus muscle/Quadratus lumborum muscle/Psoas minor muscle

posterior abdominal wall muscles are

muscles of the pelvic floor

primarily made up of thick skeletal muscles along with nearby ligaments and their investing fascia* Clinical significance: provide structural support and help maintain continence

Muscles of the Shoulder

support and produce the movements of the shoulder girdle They attach the appendicular skeleton of the upper limb to the axial skeleton of the trunk

Pectoralis major/Pectoralis minor/Subclavius/Serratus anterior

Anterior axio-appendicular muscles (thoraco-appendicular muscles) include the following

Trapezius/Latissimus dorsi/Levator scapulae/Rhomboid major/Rhomboid minor

EXTRINSIC Posterior axio-appendicular muscles (scapulo-humeral muscles) include the following

Deltoid/Teres major/Rotator cuff muscles

INTRINSIC Posterior axio-appendicular muscles (scapulo-humeral muscles) include the following

forearm muscles 

are responsible for flexion and extension of the wrist and digits.

flexor carpi radialis, flexor carpi ulnaris, palmaris longus

3 wrist flexors

flexor digitorum superficialis, flexor digitorum profundus, flexor pollicis longus

3 finger flexors

extensor carpi radialis longus, extensor carpi radialis brevis, extensor carpi ulnaris

3 wrist extensors

extensor digitorum, extensor indicis, extensor digiti minimi

3 finger extensors

abductor pollicis longus, extensor pollicis brevis, extensor pollicis longus

3 thumb extensors