Unit 4 Skeletal System 1. List the 5 functions of the Skeletal System Supports the body Protects soft body parts Produces Blood Cells Stores fats and.
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2.What is the relationship of the Epiphyseal disk to Growth? The epiphysis of a bone is covered with a disk made of cartilage As the bone grows larger, the disk recedes When the bone has grown as large as it will get- the disk is GONE
Epiphyseal disk and Growth An orthodontist may xray the wrist of a patient to see the size of the disk to determine if the patient is done growing. A patient with crowded teeth may not need braces if there is going to be growth of the jaw bones to accommodate the teeth!
3. 2 Types of Bone development Bone formation is called ossification Long bones develop from cartilage=ENDOCHONDRIAL All other bones develop from connective tissue= INTRAMEMBRANOUS Osteoblast- cell that produces bone Osteoclasts- resorb bone
4. Skeleton is divided into the Axial and Appendicular APPENDICULAR Pectoral Upper Limbs(arms) Pelvic Lower limbs( legs) AXIAL Skull (face & cranium) Vertebra Thoracic
More on the Facial bones Maxillae- upper jaw Zygomatic- cheek Lacrimal- tear duct in corner of eye Nasal- bridge of nose where glasses sit Inferior conchae- spiral shaped inside nostrils Vomer- divides nostrils Mandible- lower jaw
Facial bone- Palatal Palatal- small L shaped bone behind the palatal process of the maxillae
8 Cranial Bones of the Skull protect the brain 1 Frontal- forehead 2 Parietal- top of head 1 Occipital- base, where vertebae attach 2 Temporal- temples 1 Sphenoid- outside eye orbits 1 Ethmoid- inside eye orbits
Hyoid Bone The hyoid bone is a horseshoe shaped bone in the neck. It is the ONLY bone in the body that does not articulate with another bone! It anchors the tongue so that you can not swallow it and serves as an attachment site for muscles that make up the floor of the mouth. hyoid
The 5 Regions of the Vertebral Column Cervical- 7- neck area Thoracic- 12- chest area Lumbar- 5- small of back Sacrum- 5- hip area Coccyx- fused- tailbone Vertebra=spine Bones seperated by disks
Bones of the THORACIC Cage (CHEST) 12 pair of RIBS STERNUM The tip of the sternum is called the XYPHOID process- you will hear of this in CPR Thoracic bones protect the heart and lungs!
Name the 4 sections of the APPENDICULAR skeleton PECTORAL- shoulder UPPER LIMB- arms PELVIC- hip LOWER LIMB- legs Next, let’s look at the major bones in each of these sections of the appendicular skeleton