ETHMOID BONE, VMER, INFERIOR NASA CONCHA, ZYGOMATIC BONE,NASAL BONE, LACRIMAL BONE, PALATINE BONE, HYOID BONE

ethmoid bone

a very light cuboidal bone that is situated between the two orbis

cribriform plate

a horizontal bony lamina that occupies the ethmoidal notch of the frontal bone

cribriform plate

contains foramina for olfactory nerve rootlets

crista galli

→ a median tooth like upward projction that transmits anterior ethmoidal nerve to the nasal cavity

perpendicular plate

→ are thim lamina projecting downwards from the undersurface of the cribriform plate

perpendicular plate

forms the upper part of the nasal septum

labyrinths

are two light cubical masses situated on each side of the perpendiculate plate

labyrinths

encloses a large number of “air cells” arranged in three groups

vomer

a singlt, thin, flat bone that forms the posteroinferior part of the nasal septum

inferior nasal concha

are two curved bony lamina that are horizontally places in the lower part of the lateral wall of the nose

zygomatic bone

are two small quadrilateral shaped bone that is present in the upper and lateral surface of the face; forms the promience of the cheeks

lateral surface of the zygomatic bone

presents the zygomaticofacial foramen

temporal surface of the zygomatic bone

presents the zygomaticotemporal foramen

orbital surface of the zygomatic bone

presents two zygomaticoorbital foramen and zygomatitemporal foramina

nasal bone

are two small oblong bone that forms the bridge of the nose

lacrimal bone

are extremely delicate and the smallest bone in the skull

lacrimal bone

forms the anterior part of the medial part of the orbit

palatine bone

are two L-shapd bones that formes:

- lateral wall and floor of the nasal cavity

- roof of the mouth

- floor of the orbit

- parts of the pterygopalatine fossa

horizontal plate of the palatine bone

forms the posterior one-fourth part of the bony palate

lesser palatine foramina

the inferior surface of the pyramidal process of the palatine bone is pierced by ___

medial pterygoid plate

the lateral surface o the sphenoidal process of palatine bone articulates with __

hyoid bone

a U-shaped bone situated in the anterior midline of the neck between the chin and thyroid cartilage

hyoid bone

provide attachment to the muscles of the floor of the mouth to the tongue,larynx, pharynx, and epiglottis

body

the central part of the hyoid bone is called ___

greater and lesser cornua

the two pairs of cornua of hyoid bone

greater cornua

→ is flattened from above downwards

→ tapers posterior, but ends in a tubercle

lesser cornua

→ are small conical pieces of bone which project the junction of the body and greater cornua

→ provodes attachment to the stylohyoid ligament

anterior surface of the body of hyoid bone

→ provides inserion to geniohyoid and mylohyoid muscle

→ ives origin to a part of hypoglossus

upper border of the body of hyoid bone

→ provides insertion to the lower fibers of genioglossi

→ provide attachment to he thyroid membrane

lower border of the body of hyoid bone

provides attachment to the pretracheal fascia

medial border of the greater cornua

provides attacment to the thyroid membrane, stylohyoid muscle, and digastric pulley