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PIMA BIO130

CHP8 Skeletal; Cranial Bones and Their Markings; Sphenoid

QuestionAnswer
Sphenoid Keystone of the cranial floor; forms its midportion; resembles a bat with wings outstretched and legs extended downward posteriorly; lies behind and slightly above the nose and throat; forms part of the floor and sidewalls of the orbit
Body Hollow, cubelike central portion
Greater wings Lateral projections from the body; form part of the outer wall of the orbit
Lesser wings Thin, triangular projections from the upper part of the sphenoid body; form the posterior part of the roof of the orbit
Sella turcica Saddle-shaped depression on the upper surface of the sphenoid body; contains, the pituitary gland; literally "turkish saddle"
Sphenoid sinuses Irregular mucosa-lined, air-filled spaces within the central part of the sphenoid
Pterygoid processes Downward projections on either side where the body and greater wing unite; comparable to the extended legs of a bat if the entire bone is likened to this animal; form part of the lateral nasal wall
Optic foramen Opening into the orbit at the root of the lesser wing; transmits the optic nerve
Superior orbital fissure Slitlike opening into the orbit; lateral to the optic foramen; transmits the third, fourth, and part of the fifth cranial nerves
Foramen rotundum Opening in the greater wing that transmits the maxillary division of the fifth cranial nerve
Foramen ovale Opening in the greater wing that transmits the mandibular division of the fifth cranial nerve
Foramen lacerum Opening at the junction of the sphenoid, temporal, and occipital bones; transmits a branch of the ascending pharyngeal artery
Foramen spinosum Opening in the greater wing that transmits the middle meningeal artery to supply the meninges
Created by: Jgiron6994