Part 3-Axial Skeleton and Fetal Skull Answer the following 1. Which are the main
ID: 152257 • Letter: P
Question
Part 3-Axial Skeleton and Fetal Skull Answer the following 1. Which are the main bones of the axial skeleton? questions, then identify the structures on the fetal skull in Figure 7.30 below 2. What term refers to the openings between the bones in a fetal skull? Why does a fetal skull have these openings? 3. 4. At what age do these openings bind together and harden? FIGURE 7.30 Fetal Skull. (A) anterior view; (B) posterior view Part 4 - Appendicular skeleton 1. List the bones of the shoulder girdle and state its function 2. List the bones of the pelvic girdle and state its function: 3. Which of these two girdles is more flexible? 4. Which of these two girdles is more stable? 198 I BIO 141 Human Anatomy and PhysiologyExplanation / Answer
Ans1) main bones of axial skeleton are -
Vertebras-thoracic,lumbar,saccrum,coccyx
Cranial bone-parietal,temporal,occipital etc
Facial bones-maxilla,mandible
Sternum
Ribs
Ans2) opening between bones in fetal skeleton is known as sutures
Ans3) fetal skeleton has sutures which assist in growth .They provide the necessary space for the internal organs to grow and so they help in providing space by expanding so as to fit in the grown organ.
Ans4)
In children these sutures mostly bind at the age of 9-15 months but some may take as much as 22-39 years to bind.
Part 4-
Ans1) The bones of shoulder girdle are-
Scapula-stabalizes arm for a movements
Clavicle-hold the arms and support them by connecting to trunk
Humerus-connects shoulder with elbow and help in hand movement.
Ans2) bones of pelvic girdle
Ilium-largest flat bone,provides attachment of muscles of trunk and lower limb.
Ischium-sitting bone,acts as weight bearing bone.
Pubis-forms width of hip
Provides space for accomdating internal organs
Ans3) shoulder girdle is more flexible as wide range of movements possible
Ans4) pelvic girdle is more stable as it bears the weight of body