BIOL126 Lecture Notes - Lecture 7: Hyaline Cartilage, Medullary Cavity, Appendicular Skeleton

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Skeletal System
4.1. Functions of the skeletal system
1. Support: provides structural framework for attachment of other tissues
2. Protection: soft tissues protected from impact damage. eg. skull protects brain; ribs protect
heart and lungs
3. Leverage: muscles pull on bones = act like levers in joints; permit a range of movements in the
body; allow expansion of ribs for breathing
4. Storage of minerals and lipids: yellow marrow in medullary cavities stores lipids; bone matrix
stores minerals eg. calcium and phosphorous
5. Blood cell production: red marrow in spongy bone produces erythrocytes, white blood cells,
lymphocytes and megakaryocytes (produce platelets)
4.2. Components of the skeletal system
4.2.1. bones, tendons, ligaments
1. Bones: comprise 20% of body mass.
2. Cartilage:
i. Hyaline cartilage eg. supporting airways and on ends of bones in joints.
ii. Elastic cartilage eg. epiglottis and in the pinna of the ear.
iii. Fibrocartilage eg. intervertebral discs and between pubic bones.
3. Ligaments: stabilise bones and join bone to bone.
4. Joints: allow movement and mobility for the body
4.2.2. axial and appendicular skeletons
Axial:
-80 Bones of the axis of the body
-Cranial and facial bones (skull); auditory ossicles; hyoid; sternum; ribs; vertebrae; sacrum;
coccyx.
-Cranial bones you should know are the frontal, temporal, parietal and occipital
-Facial bones you should know are the nasal, zygomatic, mandible and maxilla
Appendicular:
-126 Bones of the pectoral and pelvic girdles, plus bones of the limbs
-Appendicular skeleton bones are the: clavicle; scapula; humerus, radius; ulna; carpal and
metacarpal bones; phalanges; hip; femur; patella; tibia; fibula; tarsal and metatarsal bones.
Calcaneus is the heel bone
-Upper limbs specialised for ease and range of movement; lower limbs specialised for locomotion
and support
4.2.3. location and names of major bones
4.2.4. how bones are classified
4.3. Anatomy of bone
4.3.1. anatomy of long bones
Articular cartilage: hyaline cartilage; covers and protects ends of long bones in joints
Epiphysis: rounded head of bone; articulates within a joint; contains spongy bone; epiphyseal line
where longitudinal bone growth occurs
Diaphysis: extended, tubular shaft of bone; provides strength via thick layer of compact bone;
contains medullary cavity
Metaphysis: small joining region between epiphysis and the diaphysis
Periosteum: membrane surrounding outermost layer of bone (except on articular surfaces); tough,
fibrous outer layer for protection, inner cell layer with Osteoblasts, Osteoclasts and
Osteoprogenitor cells
Endosteum: covers Trabeculae and lines Medullary cavity; incomplete, single, flat
layer of Osteoprogenitor cells, Osteoclasts and Osteoblasts for bone growth, repair
and remodelling
Medullary cavity: contains/stores yellow marrow.
Yellow marrow: lipid (fat) storage for the body, along with Adipose tissue.
Red marrow: produces red and white blood cells, Lymphocytes, Megakaryocytes (which form
Platelets) i.e. Haemopoiesis.
4.3.2. anatomical landmarks
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Document Summary

80 bones of the axis of the body. Cranial and facial bones (skull); auditory ossicles; hyoid; sternum; ribs; vertebrae; sacrum; coccyx. Cranial bones you should know are the frontal, temporal, parietal and occipital. Facial bones you should know are the nasal, zygomatic, mandible and maxilla. 126 bones of the pectoral and pelvic girdles, plus bones of the limbs. Appendicular skeleton bones are the: clavicle; scapula; humerus, radius; ulna; carpal and metacarpal bones; phalanges; hip; femur; patella; tibia; bula; tarsal and metatarsal bones. Upper limbs specialised for ease and range of movement; lower limbs specialised for locomotion and support. Articular cartilage: hyaline cartilage; covers and protects ends of long bones in joints. Epiphysis: rounded head of bone; articulates within a joint; contains spongy bone; epiphyseal line where longitudinal bone growth occurs. Diaphysis: extended, tubular shaft of bone; provides strength via thick layer of compact bone; contains medullary cavity. Metaphysis: small joining region between epiphysis and the diaphysis.

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