exam 3 - EXAM #3 MUCLES AND MOVEMENTS: HEAD, NECK, TRUNK...

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EXAM #3 MUCLES AND MOVEMENTS: HEAD, NECK, TRUNK TEMPOROMANDIBULAR JOINT (TMJ)- muscles of mastication (chewing); controls position of mandible Location: superficial (close to skin) and deep (to mandible) Muscle function: elevation (closing mouth), protraction (push jaw forward), retraction (pull jaw back) o Jaw depression- gravity (don't need to worry about this muscle) Superficial Muscles: Masseter o Origin: zygomatic arch (on the bone that moves least and when muscle engages) o Insertion: ramus and angle of mandible (lateral surface) o Function: elevation of mandible- “clench your teeth easy to palpate” Temporalis- attaches to temporal bone and mandible o Origin: lateral skull o Insertion: coronoid process of mandible o Function: elevation (“clench teeth”, feel temporalis source of tension headache) and retraction of mandible Muscles Deep to Mandible: Lateral pterygoid- aims out laterally o Origin: sphenoid bone o Insertion: neck of mandible (mandibular condyle) o Function: protraction of mandible (pulls towards sphenoid) Medial pterygoid o Origin: sphenoid bone o Insertion: ramus and angle of mandible (medial surface) o Function: elevation of mandible
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FUNCTIONS OF TMJ Protraction- lateral pterygoid Retraction- temporalis Elevation- masseter, temporalis, medial pterygoid o *important to survival (chewing food) SPINE- anterior and posterior muscles (portion of head on spine) Muscle function: spine has 3 degrees of freedom (motion in frontal, sagittal, and transverse planes flexor/extensors; ipsilateral/contralateral rotators; lateral flexors Anterior Muscles: NECK MUSCLES Sternocleidomastoid o Origin: sternum and medial third of clavicle o Insertion: mastoid process o Function: flexion, contralateral rotation (when you flex right one, head goes left) Scalene muscles- deeper than sternocleidomastoid; scalenus muscles aid in impingement of arteries and nerves when there is an extra cervical rib o Scalenus anterior (attaches most anteriorly), Scalenus medius (attaches medially), Scalenus posterior (attaches most posteriorly) o Origin: transverse process of cervical vertebrae (*don't need to know exactly which ones) o Insertion: first 2 ribs o Function: lateral flexion; elevation of ribs Prevertebral muscles- front of vertebrae; very deep o Longus colli, Longus capitis – attaches to occipital bone on head (capitis=head) Origin: cervical and thoracic vertebrae
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Insertion: cervical vertebrae (colli), occipital bone (capitis) Function: flexion, lateral flexion o Rectus capitis anterior, Rectus capitis lateralis (rectus= straight) Origin: atlas (very small) Insertion: occipital bone Function: flexion, lateral flexion ANTERIOR ABDOMEN MUSCLES Abdominals- superficial muscles Rectus abdominis o Origin: pubic crest o Insertion: xiphoid process and costal cartilages o Function: flexion o Special notes: tendinous inscriptions, rectus sheath, linea alba External oblique
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This note was uploaded on 02/18/2011 for the course MVS 230 taught by Professor Gross during the Winter '10 term at University of Michigan.

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exam 3 - EXAM #3 MUCLES AND MOVEMENTS: HEAD, NECK, TRUNK...

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