Advertisement Upgrade to remove ads

Epicranius M.
-Epicranial aponeurosis-

Origin: All bellies- epicranial aponeurosis

Insertion: Occipital belly- occipital bone; Frontal belly- skin of eyebrow and nose; Lateral bellies- muscle and cartilage of the auricle.

Action: Move the scalp (wrinkle brow "wiggle" ears, etc.)

Orbicularis

The muscle which encircles the eyelids.

Action: Close Eyelids

Corrugator Supercilii M

Origin: Orbicularis oculi muscle and nasal prominence of frontal bone.

Insertion: skin of eyebrow

Action: Draw eyebrow downward and medially; the "frown" muscle

Orbicularis Oris M

The muscle which incircles the oral opening

Action: close and purse the lips

Levator Labii Superioris M

Origin: Maxilla and Zygomatic bone

Insertion: Into orbicularis oris m. of upper lip

Action: Elevate upper lip

Levator Anguli Oris M

Origin: Maxilla (canine fossa)

Insertion: Orbicularis Oris M. and skin at corner of mouth

Action: Raises angle of mouth

Zygomaticus Major M

Origin: Zygomatic bone (near temporal process)

Insertion: Orbicularis Oris M at angle (corner) of mouth

Action: Draw upper lip back and upward

Zygomaticus Minor M

Origin: Zygomatic bone (near maxillary suture)

Insertion: Orbicularis Oris and Levator Labii Superioris Muscles

Action: Draw upper lip and laterally

Depressor Labii Inferioris M

Origin: Anterior aspect of Mandible (between mandibular symphysis and mental foramen)

Insertion: Into orbicularis oris m (and skin) of lower lip

Action: depress lower lip

Depressor Anguli Oris M

Origin: anterior aspect of mandible

Insertion: into orbicularis oris m (and other mucles) near corner of mouth

Action: Depress corner of mouth

Nasalis Muscle

Origin: Maxilla

Insertion: into contralateral muscle (over bridge of nose) and into ala of nose

Action: wrinkle nose and dilate nostrils

Temporalis Muscle

Origin: Temporal Fossa of the skull

Insertion: Coronoid process (and adjacent ramus) of mandible

Action: elevate mandible (clench teeth)

Masseter Muscle

Origin: Zygomatic arch of the skull

Insertion: Coronoid process and lateral aspect of ramus of mandible (down to the angle)

Action: Elevate mandible (clench teeth)

Lateral Pterygoid Muscle

Origin: Lateral wall of pterygoid process and adjacent greater wing of sphenoid bone

Insertion: Condyloid process of mandible and articular disc of temporomandibular joint

Action: Protract Mandible, depress mandible (weakly)

Medial Pterygoid Muscle

Origin: between the medial and lateral walls of the pterygoid process of the sphenoid bone, palatine bone, and maxilla.

Insertion: Medial aspect of the mandible (near the angle)

Action: Elevate mandible and move it laterally

Platysma (NOT MUSCLE)

Origin: Fascia over pectoralis major muscle and deltoideus muscle

Insertion: Lower mandibular region

Action: Depress lower lip, wrinkle skin of neck and upper chest (as in yelling/screaming)

Sternocleidomastoideus Muscle

Origin: Manubrium of the sternum and sternal extremity of the clavicle

Insertion: Mastoid process of temporal bone

Action: turn head toward opposite side (if acting unilaterally); flex joints of cervicle vertebral column (if acting bilaterally)

Pectoralis Major M

Origin: clavicle, sternum, first 6 ribs, and aponeurosis of external abdominal oblique muscle

Insertion: Crust of greater tubercle of humerus (lateral lip of intertubercular groove of humerus) and directly inferior to the greater tubercle of humerus

Action: Flex shoulder joint, adduct and medially rotate limb at shoulder joint

Pectoralis Minor M

Origin: Ribs 3-5/6 near costochondral joints

Insertion: coracoid process of scapula

Action: draw scapula anterior and down, elevate ribs

Serratus Anterior Muscle

Origin: Center of lateral aspects of first 8 or 9 ribs

Insertion: medial border of scapula (from superior angle to inferior angle)

Action: rotate scapula and pull it forward, elevate ribs

External Intercostal muscles

Origin: Inferior borders of ribs

Insertion: superior borders of ribs (each one inserts into the rib below its origin)

Action: elevate ribs (to increase the volume in the thoracic cavity), maintain tension in the intercostal spaces

Internal Intercostal muscles

Origin: Inferior borders of ribs

Insertion: superior borders of ribs (each one inserts into the rib below its origin)

Action: depress the ribs (to decrease the volume in the thoracic cavity), maintain tension in the intercostal spaces

Diaphragm (NO MUSCLE)

Is a thoracic muscle (study with respiratory system)

Rectus abdominis M
-tendinous intersectios of the rectus abdominis muscle-
-sheath of the rectus abdominis muscle-
-linea alba-

Origin: Crest and symphysis of pubis

Insertion: Xiphoid process of sternum and costal cartilages 5,6,7.

Action: Draw thorax downward (flex joints of vertebral column), compress abdomen.

External Abdominal Oblique Muscle
-Anterior layer of the sheath of the rectus abdominis muscle-
-Inguinal ligament-

Origin: ribs 5-12

Insertion: anterior lamina of the sheath of rectus abdominis muscle (and thence to the linea alba), anterior half of iliac crest (lateral aspect), inguinal ligament.

Action: draw thorax downward (flex joints of vertebral column, compress abdomen, rotate vertebral column)

Internal abdominal oblique muscle

Origin: anterior half of the crest of ilium, lumbar fascia, iliac fascia, inguinal ligament

Insertion: ribs 10-12, sheath of rectus abdominis muscle (and thence to linea alba)

Action: draw thorax downward (flex joints of vertebral column), compress abdomen, and rotate vertebral column

Transversus abdominis muscle
-Posterior layer of the sheath of the rectus abdominis muscle-

Origin: costal cartilages of ribs 7-12, lumbar fascia, iliac crest, inguinal ligament.

Insertion: Xiphoid process of sternum, posterior lamina of sheath of rectus abdominis m. (and thence to linea alba).

Action: compress abdomen

Urogenital Diaphragm

KNOW IT

Pelvic Diaphragm

KNOW IT

Trapezius m

Origin: occipital bone, nuchal ligament, spinous process of C7 and thoracic vertebrae

Insertion: clavicle, spine and acromion of scapula

Action: draw head laterally or posteriorly, rotate scapula

Latissimus Dorsi m

Origin: spinous process of lower five or six thoracic vertebrae, those of the lumbar vertebrae and median sacral crest.

Insertion: with teres major muscle into the medial border of intertubercular groove (crest of lesser tubercle) of humerus.

Action: adduct limb at shoulder joint, rotate limb medially at shoulder joint, extend shoulder joint. The latissimus dorsi muscle is the most powerful "pull up" muscle

Rhomboideus major m

Origin: spinous processes (and corresponding supraspinous ligaments) of thoracic vertebrae 2-5

Insertion: medial border of scapula below level of its spine.

Action: pull (retract) scapula toward vertebral column

Rhomboideus minor m

Origin: spinous processes of C7 and T1

Insertion: medial border of scapula at the level of its spine

Action: pull scapula toward vertebral column and slightly superiorly

Levator Scapulae m

Origin: transverse processes of first four cervical vertebrae.

Insertion: superior angle of scapula

Action: elevate scapula

The erector spinae muscles

It consits of a Spinalis muscle, longissimus muscle, and iliocostalis muscle

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