LING 2P90 Lecture Notes - Lecture 20: Foramen Lacerum, Foramen Magnum, Anterior Cranial Fossa
7 Dec 2014
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Document Summary
Epithelial bag containing muscle and lymphatic tissue. Connected to mandible and hyoid bone by muscle and connective tissue (example: frenulum) 4 parts: tip, blade, front, back. Longitudinal fibers: superior longitudinal fibers (shorten tongue; curl tip and sides, inferior longitudinal fibers (shorten tongue; pulls tip downward) Transverse fibers: narrow and elongates tongue. Genioglossus: forms bulk of the tongue, flat, triangular shape; upper and lower fibers, origin: posterior surface of mandibular symphysis (inner surface of mandible, insertions: Upper fibers= fan-like radiation to dorsum of tongue (tip to root: actions: Posterior fibers draw tongue forward for protrusion or to contact alveolar ridge. Center muscle draws tongue downward (forms central groove) Styloglossus muscle: narrow muscle, origin: styloid process, insertions: Hyoglossus muscle fibers at sides of tongue: actions: Draws tongue upward and backward (opposes genioglossus muscle) Hyoglossus muscle: thin sheet of muscle, origin: hyoid bone (upper border, insertion: side of tongue (fibers blend with palatoglossus, styloglossus and intrinsic muscles of tongue, action:
