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--Muscles--

Muscles of the head neck and spine

MuscleOriginInsertionAction
- Frontal belly
- Posterior belly Galae aponeurotica (anteriorly) Occipital and temporal bones (posteriorly) Skin of eyebrows and root of nose (anteriorly)
Galae aponeurotica
(posteriorly) Elevates eyebrow, wrinkles forehead skin horizontally (frontalis);
Fixes galae aponeurotica and pulls scalp posteriorly (occipitalis)
Orbicularis oculi
Frontal and maxillary bones Tissue of eyelid Closes eye, draws eyebrows inferiorly
Orbicularis oris
O. oris o. oris Constricts and protrudes lips
Levator labii superioris
Maxilla, zygomatic o. oris Elevate lip
Depressor labii inferioris
Mandible o. oris Depress lip
Depressor anguli oris
Mandible o. oris Depress corners of the mouth
Levator anguli oris
Maxilla o. oris Raise mouth corners
*Buccinator
Maxilla, mandible o. oris Tense cheek
Risorius
Masseter o. oris Pulls corners of the mouth back – grimace
Zygomaticus
Zygomatic bone o. oris Raise corners of the mouth “smiling muscle”
*Note: This muscle is involved in both facial expression and mastication!
Muscles of mastication
Origin Insertion Action
Masseter
Zygomatic, temporal
(zygomatic arch) Mandible Chewing (jaw closure)
Temporalis
Temporal Coronoid process of the Mandible Chewing (jaw closure)
Pterygoids (lateral and medial)
Sphenoid, palatine, maxilla Mandible Chewing (closure, protrusion, and side to side motion of mandible)
*Buccinator
Maxilla, mandible o. oris Tense cheek
Muscles of the neck
Origin Insertion Action
Platysma
Fascia of chest muscles Mandible Tense skin of the neck
Sternocleidomastoid
Sternum and Clavicle Mastoid process Flexes and laterally rotates the head
Scalenes
Transverse processes of cervical vertebrae Ribs 1 and 2 Elevates first two ribs; flex and rotates neck
Splenius Capitus Ligamentum nuchae, spinous process of cervical vertebrea Mastoid process and occipital bone Extend or hyperextend head
Semispinalis capitis
Cervical and thoracic vertebrae Occipital bone Extends skull
Mylohyoid
Mandible Hyoid bone Elevates hyoid & floor of the mouth
Omohyoid
Scapula Hyoid bone Depress and retracts hyoid
Stylohyoid
Styloid process of the temporal bone Hyoid bone Elevate and retracts hyoid
Digastric
Mandible, mastoid process of the temporalbone Hyoid bone Open mouth and depress mandible, steady hyoid during swallowing
Muscles of the Spine (page 338 text)
Erector spinae Origin Insertion Action
Iliocostalis Iliac crest; ribs Ribs; Transverse processes of cervical vertebrae Extend and laterally flex spine
Longissimus Transverse processes of Lumbar & thoracic vertebrae Transverse processes of Thoracic & cervical vertebrae; ribs; skull mastoid process
Spinalis Spinous processes of Lumbar & thoracic vertebrae Spinous processes Thoracic & cervical vertebrae
Epicranius
Created by: kayceh