Lab 3/4

Question 1

Wormian (Sutural) Bones

Answer 1

Small, intra sutural bones. Usually found between the occipital and parietal bones and are an anatomical variation

Question 2

Parietal Bones

Answer 2

Cranial bones forming the central side and upper back part of each side of the skull (2)

Question 3

Squamous suture

Answer 3

Separates the temporal bone from the parietal bone

Question 4

Temporal bones

Answer 4

Bones that form part of the side of the skull on each side and enclose the middle and inner ear (2)

Question 5

External auditory canal/meatus

Answer 5

Hole on the side of the head where the ear attaches

Question 6

Styloid Process

Answer 6

Long, thin spine medial to the mastoid process

Question 7

Mastoid Process

Answer 7

Large process posterior and interior to the external auditory canal, larger in males

Question 8

Zygomatic Process

Answer 8

Bony process found lateral to & forming a thing bridge of the bone superficial to the sphenoid bone. Makes up the upper part of the cheek (cheekbone)

Question 9

Mandibular (Glenoid) Fossa

Answer 9

The depression in the temporal bone that articulates with the mandible

Question 10

Fossa

Answer 10

Depression or hollow, usually in a bone

Question 11

Ramus

Answer 11

Arm or branch of a bone

Question 12

Petrous Portion

Answer 12

Pyramid-shaped, medial part of the temporal bone and separates the middle and posterior cranial fossae. It is extremely solid and protects the interior auditory and vestibular apparatus. The internal acoustic meatus is located at the posterior surface leading to the ear canal

Question 13

Supraorbital margin

Answer 13

Eyebrows

Question 14

Frontal Bone

Answer 14

Large bone that makes up the forehead. It is a single bone that makes up the orbits and has 2 ridges above the eyes with holes in each of these ridges

Question 15

Supraorbital foramen (notch)

Answer 15

Holes in each of the supraorbital margins where nerves and arteries reach the face

Question 16

Frontal Squama

Answer 16

Where the forehead is

Question 17

Glabella

Answer 17

Space between the eyebrows

Question 18

Occipital Bone

Answer 18

Situated at the back and lower part of the cranium, is trapezoid in shape and curved on itself

Question 19

Foramen

Answer 19

Opening, hole, or passage, especially in a bone

Question 20

Foramen magnum

Answer 20

Largest hole in the skull, the boundary between the brain and the spinal cord

Question 21

Occipital condyles

Answer 21

Processes that articulate with the first cervical vertebra (atlas)

Question 22

External occipital protuberance

Answer 22

Small bump at the posterior part of the occipital bone where muscles attach

Question 23

Sphenoid Bone

Answer 23

Unpaired cranial bone that traverses the skull. Shaped like a butterfly or a wasp, which occupies most of the middle part of the skull’s base, making up the middle region of the cranial fossa

Question 24

Sella turcica

Answer 24

Posterior to the lesser wings of the sphenoid

Question 25

Pterygoid processes

Answer 25

Pterygoid - “winglike” One on either side of the sphenoid, descends perpendicularly from the regions where the body and the greater wings of the sphenoid bone unite. Each process consists of a medial pterygoid plate and a lateral pterygoid plate, the latter of which serve as the origins of the medial and lateral pterygoid muscles

Question 26

Optic foramen/canal

Answer 26

Passageway for the optic nerve in the sphenoid

Question 27

Superior orbital fissure

Answer 27

A foramen in the skull, lying between the lesser and greater wings of the sphenoid bone.

Question 28

Ethmoid

Answer 28

A small unpaired bone, located in the midline of the anterior cranium – the superior aspect of the skull that encloses and protects the brain

Question 29

Crista galli

Answer 29

A sharp ridge that projects from the main portion of the ethmoid

Question 30

Cribriform plate

Answer 30

Small, horizontal plate of the bone with numerous holes lateral to the crista galli

Question 31

Perpendicular plate of the ethmoid bone

Answer 31

Thin, flattened lamina (thin layer, plate of organic tissue), polygonal in form, which descends from the under surface of the cribriform plate, and assists in forming the septum of the nose; it is generally deflected a little to one or other side

Question 32

Lateral masses (labyrinthis)

Answer 32

Consists of a number of thin-walled cellular cavities, the ethmoidal cells, arranged in three groups, anterior, middle, and posterior, and interposed between two vertical plates of bone; the lateral plate forms part of the orbit, the medial plate forms part of the nasal cavity

Question 33

Medial nasal concha

Answer 33

Top one

Question 34

Inferior nasal concha

Answer 34

Lower top

Question 35

Vomer

Answer 35

The small thin bone separating the left and right nasal cavities

Question 36

Maxillae

Answer 36

The jaw or jawbone, specifically the upper jaw in most vertebrates