Bones (wk1) Flashcards
Function of the skeleton - Support
-It provides a framework
Function of the skeleton - Protection
-Bones protect our internal organs
Function of the skeleton - Movement
-The body can move as a whole or in individual parts/limbs
Function of the skeleton - Production of RBC
-Some bones such as the pelvis contain bone marrow, which can produce platelets, red blood cells and white blood cells
Function of the skeleton - Storage of minerals
-Bones store minerals such as calcium and iron
Function of the skeleton - Endocrine regulation
-Bones secrete hormones and thereby control various psychological pathways
The axial and appendicular skeleton
-Most people have 206 bones when they get to adulthood
-The axial skeleton is the main trunk and consists of the skull, vertebral spinal column, sternum and ribs (thoracic cage)
-The appendicular skeleton consists of the extremities of the body, predominantly the limbs e.g. shoulder girdle and arms
The axial skeleton - Skull
-The cranium consists of 22 bones; split into 8 bones at the back and 14 facial bones
-The main goal is to protect the brain
-Complete the diagram (27/09)
The axial skeleton - Vertebral column
-It is also known as the spinal column and extends from the skull to the pelvis
-It is made up of individual vertebrae, which are interconnected by a cartilaginous intervertebral disk
-Divided into 7 regions; 7 cervical, 12 thoracic, 5 lumbar, 5 (fused) sacrum and 3-5 (fused) coccyx
-When viewed laterally, there are 4 curvatures
-It protects the spinal cord
The axial skeleton - Thoracic cage
-Consists of 12 pairs of ribs, their costal cartilage and the sternum/breastbone
-Ribs 1-7 are classed as true ribs as they adjoin directly onto the sternum
-Ribs 8 -12 are considered to be false ribs as they don’t attach by their own costal cartilage onto the sternum
-Ribs 11-12 are floating ribs as they don’t attach to the sternum at all
The appendicular skeleton - Shoulder girdle and arms
-The shoulder girdle consists of the clavicle and the scapula
-The arms attach to the shoulder girdle
The appendicular skeleton - Hands
-There are 8 carpal bones in each wrist
-There are 5 metacarpal bones in each hand/wrist
-There are 5 proximal phalanges, 4 intermediate and 5 distal phalanges in each of our hands
-The distal row of the carpal bones are; capitate, trapezium, trapezoid and hamate
-The proximal row of the carpal bones are; pisiform, triquetrum, lunate and scaphoid
The appendicular skeleton - Pelvic girdle and legs
-Consists of 2 bones which then attach to the sacrum to form our pelvic ring, where the legs then attach
-There’s 3 parts to the innominate bones; ilium, ischium and pubis
The appendicular skeleton - Feet
-There are 7 tarsals in each foot
-There are 3 types of cuneiform; medial, intermediate and lateral
-5 metatarsals
-2 phalanges in the big toes, but each of the other toes have 3 (14 in each foot)
What are the different types of bones?
Long, Sesamoid, Flat, Irregular and Short
Description of a long bone
-They function to support the weight of the body and facilitate movement e.g. femur
Description of a sesamoid bone
-These are embedded in tendons e.g. found in tendons of the feet and hands
Description of a flat bone
-They can provide protection e.g. cranium
Description of an irregular bone
-Help protect specific internal organs e.g. bones of the pelvic and vertebrae
Description of a short bone
-They provide stability and some movement e.g. wrist bones
Bone composition
-Osseous tissue -> Collagen and hard minerals (make bones hard and rigid) e.g. calcium, magnesium and phosphate
-There are 2 types;
1. Cancellous or spongy bone (honeycomb structure)
2. Compact bone
Bone - Structured and mechanical properties
-Compact -> Dense and tough (provides protective layer)
-Spongy -> Light and strong (trabeculae) - found on the inside of bones and is very light
What is the structure of a long bone? (and description)
-Most common bones found in the human body
-Composed mostly of compact bone and have enlarged ends that are filled with spongy bone
-The dialysis is the shaft of the long bone and makes up the length of the bone
-The epiphysis is the two ends of the bone, which is covered in articular cartilage, which allows the bones to slide past one another. The interior is filled with spongy bone
-The medullary canal is where the yellow bone marrow is found in adults
Bone cells
-Osteoblasts -> Bone forming cells e.g. found in some immature bones
-Osteoclasts -> Break down the bone, releasing the calcium and phosphate and help to continue the remodelling of healthy bone tissue
-Osteocytes -> Mature bones found deep within mineralised bone