Neck and Head Muscles (w/pictures)

30 terms by austinmac13

Create a new folder

Advertisement Upgrade to remove ads

Occipitofrontalis (part of the Epicranius)
Origin
Frontal belly- epicranial aponeurosis
Occipital belly- Highest nuchal line of the Occipital bone
Insertion
Frontal belly- Tissues of eyebrows and bridge of nose
Occipital belly- Epicranial aponeurosis
Action
Frontal belly- raises eyebrows and wrinkles the forehead horizontally (expressions of surprise and fright)
Occipital belly- draws the scalp backward (expressions of surprise or fright)
Innervation:

Special Topics
Epicranius is a broad sheet of muscle and aponeurotic tissue covering the top, front and back of the head.
Aponeurosis is a broad, white tendonous tissue.

Corrugator Supercilii
Origin- Superciliary ridge of the frontal bone
Insertion- Skin of the eyebrow (just above bridge of the nose)
Action- wrinkles the forehead vertically

Obicularis Oculi
Origin- encircles the eyelid
Insertion- encircles the eyelid
Action- Closes the eye (blink, squint, wink)

Zygomaticus Major
Origin- Zygomatic bone
Insertion- Angle of the mouth
Action- Elevates the angle of the mouth (laughing & smiling)

Obicularis Oris
Origin- Encircles the mouth
Insertion- Encircles the mouth
Action- Draws the lips together (pout)

Buccinator
Origin- Maxillae
Insertion- Skin of sides of the mouth
Action- Facilitates smiling and chewing; blowing (trumpet playing mm)

Masseter
Origin- Zygomatic Arch
Insertion- Angle and Coronoid Process of the Mandible
Action-
Bilateral: Elevation(chewing)
Unilateral: ipsilateral lateral deviation

Temporalis
Origin- Temporal fossa
Insertion- Coronoid process of the mandible
Action-
Bilateral: elevation and retrusion(chewing, grinding)
Unilateral: ipsilateral lateral deviation (Moves the mouth side to side in chewing.)

Medial Pterygoid
Origin- Under surface of the skull at the lateral pterygoid plates of the sphenoid
Insertion- inner surface of the ramus and angle of the mandible
Action-
Bilateral: elevation and protrusion of the jaw
Unilateral: Contralateral lateral deviation

Lateral Pterygoid
Origin- Under surface of the skull at the lateral pterygoid plates of the sphenoid
Insertion- Mandibular Condyle
Action-
Bilateral: depression and protrusion of the jaw
Unilateral: Contralateral lateral deviation

Sternocleidomastoid
Origin- Sternum and Clavicle
Insertion- Mastoid process of the temporal bone
Action-
Bilaterally: flexes the neck, Unilaterally: laterally bends the neck; rotates the head to the opposite side
Innervation: Accessory nerve

Scalenes
Origin- Transverse processes of the cervical vertebrae
Insertion- 1st and 2nd rib
Action-
Bilateral: cervical flexion
Unilaterally: lateral bending

Splenius Capitis
Origin- Ligamentum nuchae, spinous processes of C7 to T3
Insertion-Mastoid process of the temporal bone and the occipital bone
Action-
Bilaterally: cervical extension Unilaterally: Rotate and laterally bend the neck to the same side
Innervation: Middle & lower cervical nerves

Splenius Cervicis
Origin- Spinous process of vertebrae T3 to T6
Insertion- Transverse processes of C1 to C3 (cervicis)
Action-
Bilaterally: Cervical extension
Unilaterally: Rotate and laterally bend the neck to the same side
Innervation: Middle & lower cervical nerves

External Intercostals
Origin- Rib above
Insertion- Rib below
Action- Elevates ribs, to expand the ribcage during inhalation
Innervation: Intercostal nerve

Internal Intercostals
Origin- Rib below
Insertion- Rib above
Action- Depresses rib to brings ribs close together to force exhalation
Innervation: Intercostal nerve

Diaphragm
Origin- Lower circumference of the rib cage or thorax
Insertion- central tendon of the diaphragm
Action- Enlarges the rib cage causing inspiration
Innervation: Phrenic nerve

External Oblique
Origin- Ribs 5 to 12 (lower 8)
Insertion- Iliac crest and linea alba
Action-
Bilaterally: trunk flexion and compresses the abdomen
Unilaterally: Lateral bending and rotation to the opposite side
Innervation: 8th-12th intercostal, iliohypogastric & ilioinguinal nerves

Internal Oblique
Origin- Inguinal ligament, iliac crest, and thoracolumbar fascia
Insertion- Ribs 10-12 and abdominal aponeurosis
Action-
Bilaterally: trunk flexion and compression of the abdomen
Unilaterally: lateral bending; rotation to the same side
Innervation: 8th-12th intercostal, iliohypogastric & ilioinguinal nerves

Transverse Abdominis
Origin- Ribs 6 to 12, iliac crest , inguinal ligament, and thoracolumbar fascia

Insertion- Pubic bone, linea alba, abdominal aponeurosis


Action- compresses the abdomen
Innervation: 7th-12th intercostal, iliohypogastric and ilioinguinal nerves

Rectus Abdominis
Origin- Pubis
Insertion- xiphoid process and costal cartilages of ribs 5-7
Action- Compresses abdomen and trunk flexion
Innervation: 7th-12th intercostal nerves

Quadratus Lumborum
Origin- Iliac crest
Insertion- Rib 12 and transverse processes of L1 to L5
Action- Trunk lateral bending
Special Topics- Aides in forced expiration
Innervation: 12th thoracic and 1st lumbar nerves

Spinalis Muscles
Origin- Lower cervical or lower thoracic/upper lumbar vertebrae
Insertion- Upper cervical or middle/upper thoracic vertebrae (superior to the origin)
Action- Extends the neck or Vertebral column
Innervation- Cervical or thoracic Nerves

Iliocostalis Muscles
Origin- Various regions of the pelvis and ribs
Insertion- Ribs and vertebra (superior to the origin)
Action- Extends, laterally flexes the vertebral column
Innervation- Spinal, thoricic, or lumbar nerves

Longissimus Muscles
Origin- Cervical and thoracic vertebrae, ribs
Insertion- Mastoid process, upper cervical vertebrae, or upper lumbar vertebrae
Action- Extends head, neck or vetebral column
Innervation- Cervical or throacic and lumbar nerves
Special Topics- Capitis and Cevicis origins are inferior to the insertion, while thoracis origin is superior to the insertion.

Semispinalis Muscles
Origin- Transverse processes
Insertion- Spinous processes of the vertebra above
Action-
Bilaterally: Extend
Unilaterally: Rotate to the opposite side
Innervation- Spinal nerves

Multifidus Muscles
Origin- Transverse processes of the vertebrae, sacrum & illium
Insertion- Spinous process vertebrae above
Action- Cervical and trunk extension, cervical and trunk rotation

Rotatores Muscles
Origin- Transverse processes
Insertion- Spinous processes of the vertabra above
Action-
Bilaterally: Extend the spine
Unilaterally: Rotate vertebrae to the opposite side
Innervation- Spinal nervers

Interspinales Group
Origin- Spinous processes of vertebrae below
Insertion- Spinous processes of the vertebrae
Above
Action-
Extend the spine
Innervation- Spinal nerves

Intertransversarii Group
Origin- Transverse process below
Insertion- Transverse process above
Action- Trunk lateral bending
Innervation- Spinal nerves

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again

Example:

Reload the page to try again!

Reload

Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording

Create Set