BIOL1008 Study Guide - Quiz Guide: Intervertebral Foramina, Hyaline Cartilage, Thoracic Vertebrae

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PRACTICAL 3: Aerobic Fitness 1
Skeletal System
The skeletal system provides the framework to support the soft tissues of the body and also
allows for movement of the human body. The system consists of dynamic, living and growing
tissues.
1. ANATOMY OF BONE
Components of bone
Name
Description
Articular cartilage
A thin layer of cartilage at the ends of long bones that articulate with
each other at the joints
Periosteum
A vascularized connective tissue layer which covers the rest of the
bone
Medullary cavity
A central cavity within the bone which in the fresh femur is filled with
fatty yellow bone marrow
Red marrow
In fetal life and early childhood, the long bones are filled with red bone
marrow. This undergoes degeneration to yellow marrow in adulthood
except at the very ends of the marrow cavity, where a small amount
of red marrow may persist. Red marrow is hematopoietic, i.e. it
produces new red blood cells. Red marrow also gives rise to white
blood cells
Cancellous
(spongy) bone
Consisting of a meshwork of intercrossing and connecting trabeculae
(bars) of bone within which are spaces filled with red marrow in flat
bones (e.g. sternum, ribs, coxal bones)
Compact bone
The outer, denser bone of the diaphysis (shaft)
Epiphysis
Head of the long bone. During childhood a disc of ossifying cartilage
lies between the epiphysis and the shaft and it is here that bone
growth occurs
3. ARTICULATING THE SKELETON
Thoracic vertebrae
- The intervertebral disc is a pad of cartilage between the vertebrae which allows slight
movement
- A pair of articular facets at the superior end of the vertebral arch of one vertebra forms
a joint with a pair of articulating facets on the inferior end of the vertebral arch of the
next vertebra
- Each spinal nerve passes through a space called the intervertebral foramen and there
is one on each side of the vertebral column
List the three main functions of the vertebral column
- Protect spinal cord
- Balance, flexibility, posture
- Attachment for ribs, back muscles
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How would you distinguish between the atlas (C1) and axis (C2)?
The atlas does’t have a proess ut C does. Also, they have differet shape (C is rig-like
whereas C2 is kidney-shaped)
List five functions of bone
- Protection of organs
- Movement
- Attachment for skeletal muscles
- Bone marrow: blood cells
- Stores phosphorus and calcium
4. HISTOLOGY OF BONES
The features of compact bone include the following:
- The bone matrix is perforated by a series of canals called Haversian canals. In life each
canal contains blood vessels and nerves
- The bone cells, osteocytes, are arranged around the Haversian canals in a series of
concentric circles. Each series, together with the canal, is called a Haversian system
- The matrix is secreted in such a way that it forms a series of thin, concentric cylinders,
the concentric lamellae, around the Haversian canals
- The osteocytes lie in small spaces, the lacunae, which are linked together by a series
of thin canals, the canaliculi. These contain cytoplasmic processes from the cells,
which penetrate the matrix and carry nutrients to and wastes from the osteocytes
- Between each Haversian system are patches of bone, remnants of old Haversian
system called interstitial lamellae (interstices = spaces, gaps)
- The outer rim of the bone is made up of several layers of matrix called contour
lamellae
- The external surface of the bone is surrounded by a dense fibrous connective tissue
called the periosteum. The marrow cavity of the bone is lined by the endosteum
The features of spongy or cancellous bone include the following:
- They contain structures called trabeculae. The spaces of the trabeculae are filled with
red marrow
- Do not contain Haversian canals
5. SYNOVIAL JOINT
Three functions of synovial fluid
- Lubrication: reduces friction between bones
- Nutrient distribution: circulates within a joint to provide nutrients and waste disposal
for chondrocytes
- Shock absorption: helps to distribute pressure evenly across the joint
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Document Summary

The skeletal system provides the framework to support the soft tissues of the body and also allows for movement of the human body. The system consists of dynamic, living and growing tissues: anatomy of bone. Articular cartilage a thin layer of cartilage at the ends of long bones that articulate with. A vascularized connective tissue layer which covers the rest of the bone. A central cavity within the bone which in the fresh femur is filled with fatty yellow bone marrow. In fetal life and early childhood, the long bones are filled with red bone marrow. This undergoes degeneration to yellow marrow in adulthood except at the very ends of the marrow cavity, where a small amount of red marrow may persist. Red marrow is hematopoietic, i. e. it produces new red blood cells. Red marrow also gives rise to white blood cells.

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