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A&P Lab Muscle Chart

A&P LabMuscle Chart

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
Created by: chachi2015



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