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A&P Lab Muscle Chart
A&P LabMuscle Chart
| 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 |
Created by:
chachi2015