Lab 4: Specialized CT Projections

Question 1

Answer 1

Elastic Cartilage

Characteristics: Avascular, elastic fivers stain dark and are visible; contains type II collagen

Function: Elasticity of cartilage

Location: Auditory canal, external ear, epiglottis

Question 2

Answer 2

Fibrocartilage

Characteristics: Avascular; chondrocytes arranged in rows; no periochondrium

Function: Joins certain, adjacent bones together; provides cushioning for vertebrae

Location: Symphyses, Eustacian tube, intervertebral disks, tendon insertions

Question 3

Answer 3

Endochondral Ossification

Characteristics: Hypertrophy of chondrocytes and invasion by periosteal bud

Function: Forming of marrow; bone growth

Location: Short and long bones

Question 4

Answer 4

Osteoclasts

Characteristics: Multinuclear

Function: Bone resorption and remodeling of bone

Location: Along the trabecula in Howship’s lacunae

Question 5

Answer 5

Cancellous (spongy) bone

Characteristics: Low-density; porous with numerous trabeculae

Function: Site for hemopoeisis

Location: Epiphyses of long bones, pelvis

Question 6

Answer 6

Hyaline Cartilage

Characteristics: Avascular, glass-like appearance; mostly ground substance and other non-cellular components, such as type II collagen fibers

Function: Support of structures, reduction of friction between surfaces, limited flexibility

Location: C-rings of trachea, articular surfaces, nasal cartilage

Question 7

Answer 7

Endochondral Ossification, Magnified

Characteristics: Cartilage serves as mold for ossification; chondrocytes hypertrophy, and osteoblasts secrete matrix while osteoclasts degrade matrix

Function: Forming of marrow, bone growth

Location: Short and long bones

Question 8

Answer 8

Compact bone

Characteristics: Vascular CT; Haversion system (osteon) visible; Volkmann’s canals present

Function: Support for body

Location: Long bones