Term | Definition |
Nasalis | Origin-Maxillary bone; alar cartilage of nose
Insertion- Bridge of nose
Action-Compresses nostrils |
Orbicularis oculis | Origin:Medial aspect of bony orbit
Insertion:Skin around eyelids
Action:Closes eyelid; |
Buccinator | Origin:Maxillary bone; mandible
Insertion:Blends with fibers of orbicularis oris
Action:Compresses cheek while whistling or
blowing |
Zygomaticus major | Origin:Zygomatic bone
Insertion:Angle of mouth
Action:Raises lateral corner of mouth for
smiling |
Zygomaticus minor | Origin:Zygomatic bone
Insertion:Upper lip
Action:Raises upper lip |
Levator Labii
Superioris | Origin:Inferior aspect of bony orbit
Insertion:Blends with fibers of orbicularis oris
Action:Elevates upper lip; |
Depressor Anguli Oris | Origin:Anterolateral surface of mandible
Insertion:Skin at angle of mouth
Action:Depresses angle of mouth |
Depressor Labii
Inferioris | Origin:Anterolateral surface of mandible
Insertion:Skin of lower lip
Action:Depresses lower lip |
Mentalis | Origin:Anterior surface of mandible
Insertion:Skin of chin
Action: wrinkles skin on
chin |
Masseter | Origin:Zygomatic arch
Insertion:Lateral Surface of mandibular ramus
Action:Elevates mandible to close jaw;
protrudes mandible |
Temporalis | Origin:Temporal bone
Insertion:Coronoid process of mandible
Action:Elevates mandible to close jaw |
Hyoglossus | Origin:Hyoid bone
Insertion:Tongue
Action:Depresses tongue |
Sternocleidomastoid | Origin:Manubrium; medial one-third of clavicle
Insertion:Mastoid process; occipital bone near
mastoid process
Action:Flexion and lateral flexion of neck |
Mylohyoid | Origin:Inferior margin of mandible at the
chin
Insertion:Hyoid bone
Action:Elevates hyoid bone, tongue, and
floor of mouth during swallowing and
speaking |
Sternohyoid | Origin:Manubrium
Insertion:Hyoid bone
Action |
Thyrohyoid | Origin:Thyroid cartilage of larynx
Insertion:Hyoid bone
Action:Depresses hyoid bone; |
Splenius | Origin:Spinous processes of inferior cervical
and superior thoracic vertebrae
Insertion;Mastoid process, occipital bone and
transverse processes of superior
cervical vertebrae
Action:Laterally flexes, rotates, and extends
head and neck |
Scalenes(Posterior,
middle, and anterior | Origin:Transverse processes of cervical
vertebrae
Insertion:First and second ribs
Action:Lateral flexion of neck; elevates ribs 1
and 2 during forced inspiration |
Levator Scapulae | Origin:Transverse processes of superior four
cervical vertebrae
Insertion:Medial border of scapula near
superior angle
Action:Elevates scapula; inferior rotation of
scapula |
External intercostals | Origin:Inferior border of superior rib
Insertion:Superior border of inferior rib
Action:Elevates the ribs during normal
inspiration |
Internal Intercostals | Origin:Superior border of inferior rib
Insertion:Inferior border of superior rib
Action:Depresses the ribs during forced
expiratio |
Rectus Abdominis | Origin;Pubic crest; pubic symphysi
Insertion:Xiphoid process; costal cartilages of
ribs 5-7
Action:stabilizes pelvis during walking; |
External Oblique | Origin:External surfaces of inferior eight rib
Insertion:Linea alba; pubic crest; pubic
tubercle; iliac crest
Action: Rotation and lateral flexion of trunk; |
Interal Oblique | Origin:Thoracolumbar fascia; iliac crest;
inguinal ligament
Insertion:Linea alba; pubic crest; inferior three
or four ribs
Action:Rotation and lateral flexion of trunk |
Transversus
Abdominis | Origin:Thoracolumbar fascia; inguinal
ligament; costal cartilages of inferior
six ribs; iliac crest
Insertion:Linea alba; pubic crest
Action;Increases intraabdominal pressure
during forced expiration |
Orbicularis oris | Origin :Maxillary bone; mandible
Insertion:Lips
Action:Closes and protrudes lips as in
speaking, kissing, and whistling |