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Muscles
Muscles
36
Anatomy
12th Grade
10/29/2013

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Term
Occipitofrontalis
Definition
Origin: Occipital Bone
Insertion: Tissues of eyebrows
Function: Raises eyebrows, wrinkles
forhead horizontally.
Nerve Supply: Cranial Nerve VII
Term
Corrugator supercilii
Definition
Origin: Frontal Bone
Insertion: Skin of eyebrow
Function: Wrinkles forehead vertically
Nerve Supply: Cranial Nerve VII
Term
Orbicularis Oculi
Definition
Origin: Encircles Eyelid
Insertion:
Function: Closes Eye
Nerve Supply: Cranial Nerve VII
Term
Zygomaticus major
Definition
Origin: Zygomatic Bone
Insertion: Angle of Mouth
Function: Laughing
Nerve Supply: Cranial Nerve VII
Term
Orbicularis oris
Definition
Origin: Encircles mouth
Insertion:
Function: Draws lips together
Nerve Supply: Cranial Nerve II
Term
Buccinator
Definition
Origin: Maxillae
Insertion: Skin of sides of mouth
Function: Permits smiling Blowing, as
in playing a trumpet
Nerve Supply: Cranial Nerve VII
Term
Masseter
Definition
Origin: Zygomatic arch
Insertion: Mandible (external surface)
Function: Closes jaw
NErve Supply: Cranial Nerve V
Term
Temporalis
Definition
Origin: Temporal Bone
Insertion: Mandible
Function: Closes jaw
Nerve Supply: Cranial Nerve VII
Term
Pterygoids
Definition
Origin: Undersurface of skull
Insertion: Mandible (medial surface)
Function: Grates teeth
NErve Supply: Cranial Nerve V
Term
Sternocleidomastoid
Definition
Origin: Sternum Clavicle
Insertion: Temporal bone (mastoid process)
Function: Flexes head (prayer muscle)
Nerve Supply: Accessory Nerve
Term
Semispinalis capitis
Definition
Origin: Vertebrae
Insertion: Occipital bone
Function: Extends head; bends it
laterally
NErve Supply: First 5 cervical nerves
Term
Splenius capitis
Definition
Origin: Ligamentum nuchae
Insertion: Temporal bone (mastoid process)
Function: Extends head
Nerve Supply: 2nd, 3rd and 4th cervical nerves
Term
Longissimus Capitis
Definition
Origin: Vertebrae
Insertion: Temporal Bone
Function: Extends head bends and
rotates head toward contracting side
Nerve Supply: Multiplle Innervation
Term
External Intercostals
Definition
Origin: Rib (lower border; forward fibers)
Insertion: Rib (upper border of rib below origin)
Function: Elevate Ribs
Nerve Supply: Intercostal nerves
Term
Internal Intercostals
Definition
Origin: Rib (inner surface, lower border)
Insertion: Rib (upper dorder of rib
below origin)
Function: Depress Ribs
Nerve Supply: Intercostal Nerves
Term
Diaphragm
Definition
Origin: Lower circumference of thorax
Insertion: Central tendon of diaphragm
Function: Enlarges thorax, causing inspiration
Nerve Supply: Phrenic Nerves
Term
External Oblique
Definition
Origin: Ribs (lower 8)
Insertion: Pelvis, Linea alba
Function: Compresses abdomen Rotates trunk laterally
Nerve Supply: Lower 7 intercostal & iliohypogastric nerves
Term
Internal Oblique
Definition
Origin: Pelvis (iliac crest and inguinal ligament)
Insertion: Ribs (lower 3)
Function: Same as external oblique
Nerve Supply: Last 3 intercostal nerves; iliohypogastic & ilioinguinal nerves
Term
Transversus Abdominis
Definition
Origin: Ribs (lower 6)
Insertion: Pubic Bone
Function: Same as external oblique
Nerve Supply: Last 5 intercostal nerves; iliohypogastric and ilioinguinal nerves
Term
Rectus Abdominis
Definition
Origin: Pelvis (pubic bone and symphysis pubis)
Insertion: Sternum (xiphoid process)
Function: Same as external oblique
Nerve Supply: Last 6 intercostal nerves
Term
Quadratus Lumborum
Definition
Origin: Iliolumbar ligament; iliac crest
Insertion: Last rib; transverse process of vertebrae
Function: Flexes vertebral column laterally
Nerve Supply: Lumbar
Term
Iliocostalis group
Definition
Origin: Various regions of the pelvis and ribs
Insertion: Ribs and vertebra (superior to origin)
Function Extends, laterally flexes vertebral column
Nerve Supply: Spinal, thoracis, or lumbar nerves
Term
Longissimus group
Definition
Origin: Cervical and thoracic vertebrae, ribs
Insertion: Mastoid process, upper cervical vertebrae
Function: Extends head, neck or vertebral column
Nerve Supply Cervical, or thoracic and lumbar nerves
Term
Spinalis group
Definition
Origin: Lower cervical or lower thoracic/upper lumbar vertebrae
Insertion: Upper cervical or
middle/upper thoracic vertebrae
Function: Extends neck or vertebral
Sw column
Nerve Supply: Cervical or thoracis nerves
Term
Semispinalis Group
Definition
Origin: Transverse processes of vertebrae (T2-T11)
Insertion:Spinous processes of vertebrae (C2-T4)
Function: Extendss neck or vertebral column
Nerve Supply: Cervical or thoracic nerves
Term
Multifidus Group
Definition
Origin: Transvers processes of vertebrae; sacrum and ilium
Insertion: Spinous processes of vertebrae
Function: Extends, rotates vertebral column
Nerve Supply: Spinal nerves
Term
Rotatores group
Definition
Origin: Trasnverse processess of vertebrae
Insertion: Spinous process vertebrae
Function: Extends, rotates vertebral column
Nerve Supply: Cervical nerves
Nerve
Term
Splenius
Definition
Origin: Spinous processes of vertebrae (C7-T1 or T3-T6)
Insertion: Lateral occipital/mastoid or transverse processes of vertebrae
Function: Rotates, extends neck and flexes neck laterally
Nerve Supply: Cervical nerves
Term
Interspinales Group
Definition
Origin: Spinous processes of vertebrae
Insertion: Spinous processes
Function: Extends back and neck
Nerve Supply: Spinal Nerves
Term
Levator ani
Definition
Origin: Pubis and spine of ischium
Insertion: Coccyx
Function: Together with coccygeus muscles from floor of pelvis cavity
Nerve Supply: Pudendal nerve
Term
Ischiocavernosus
Definition
Origin: Ischium
Insertion: Penis or clitoris
Function: Compress base of penis or clitoris
Nerve Supply: Perineal nerve
Term
Bulbospongiosus Male
Definition
Origin: Bulb of penis
Insertion: Perineum and bulb of penis
Function: Constricts urethra and erects penis
Nerve Supply: Pudendal Nerve
Term
Bulbospongiosus Female
Definition
Origin: Perineum
Insertion: Base of clitoris
Function: Erects clitoris
Nerve Supply: Pudendal nerve
Term
Deep transverse perinei
Definition
Origin: Ischium
Insertion: Central tendon (median raphe)
Function: Support pelvis floor
Nerve Supply: Pudendal Nerve
Term
Sphincter urethrae
Definition
Origin: Pubic ramus
Insertion: Central tendon (median raphe)
Nerve Supply: Pudendal nerve
Term
Sphincter Externus anii
Definition
Origin: Coccyx
Insertion: Central Tendon (median raphe)
Function: Close anal canal
Nerve Supply: Pudendal and S4
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