BIO 110 Lecture Notes - Lecture 7: Periosteum, Long Bone, Medullary Cavity

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A&P I Lab - Lab 7 2021
Laboratory Assessment 12
Part A
Complete the following statements:
1. A bone that has a wide surface is classified as a (an)_Flat_________ bone
2. The bones of the wrist are examples of ____Short________ bones
3. The bone of the thigh is an example of a (an) _____Long____________ bone
4. Vertebrae are examples of ____Irregular_____________ bones
5. The patella (kneecap) is an example of a large ___sesamoid/round___bone.
6. The bones of the skull that form a protecQve covering for the brain are examples of
_____Flat__________ bone.
7. DisQnguish between the epiphysis and the diaphysis of a long bone
The epiphysis are located at the ends of the bone and the diaphysis is the shaU of the bone
8. Describe where the carQlage is found on the surface of a long bone
Around the epiphyses
9. Describe where the periosteum is found on the surface of a long bone.
The periosteum is a membrane located around the bone (except the arQcular carQlage)
Part B
1. DisQnguish the locaQons and Qssues between the periosteum and the endosteum
Periosteum is a membrane around bone except the arQcular carQlage , consisQng of dense
irregular connecQve Qssue. The endosteum is a thin membrane lining medullary cavity of
reQcular connecQve Qssue.
2. What structural dierences did you note between compact bone and spongy bone?
The spongy bone has spaces, not possessing the typical osteon units of a compact bone , rather
here the osteocytes of spongy bone are located within a la\ce of bony plates known as
trabeculae. While compact bone is solid, containing cylinder-shaped units called osteons. Here,
the cells or osteocytes are located in concentric circles within small spaces known as lacunae.
3. How are these structural dierences related to the locaQons and funcQons of these two types of
For spongy bone, the structure allows diusion of substances between the cells and the marrow
that is posiQoned between the trabeculae. For the compact bone, each osteon contains a central
canal that includes blood vessels and nerves in the living bone. For compact bone, the cellular
processes of the osteocytes pass through microscopic canaliculi, which allow for the transport of
nutrient and waste substances between the cells and the central canal.
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