Skeletal System

1. Skeletal System Chapter 7 Anatomy

2. Dem Bones! • How many bones are there in the adult skeleton? • Distinguish between the axial and appendicular skeletons. • Where is the hyoid bone located? What is its purpose? • In the front label the pectoral girdle. What bones are included? • What is the purpose of the pelvic girdle? • What are the 3 parts to the pelvic girdle?

3. We sure have lots of bones! We sure have lots of bones! A newborn baby has more bones than an adult. A baby is born with 300 bones. An adult only has 206.

4. Your hand has 27 bones.

5. Your face has 14 bones.

6. Smallest and The Longest: • The longest bone in your body is your thigh bone, the femur it is about 1/4 of your height. • The smallest bone in your body is the stirrup bone in your ear which can measure only 1/10 of an inch.

7. Did You Know? Humans and giraffes have the same number of bones in their necks? A Giraffe’s neck vertebrae are just much, much longer!

8. Bone is stronger, inch for inch than the steel used in skyscrapers. Your Femur (thigh bone) is stronger than concrete.

9. Babies are born without the patella (knee bone) it develops between ages 2 and 5.

10. One fourth of your bones are located in your feet.

11. Your backbone is really thirty-three bones that run down the middle of your body.

12. The jawbone is the hardest in the human body.

13. The only bones not broken so far during any ski accident are ones located in your middle ear.

14. If you break your wrist as an adult it will take you 8 weeks to heal. A five year old child who breaks their wrist only takes 3 weeks to heal.

15. Your big toes have 2 bones in them, while all your other toes have 3 bones in them.

16. Your bones also manufacture blood cells and stores useful minerals.

17. Appendicular Skeleton • Appendage- extension of a main structure • consists of upper and lower limbs & bones that anchor limbs • consist of 2 anchoring girdles: • pectoral girdle- clavicle and scapula • pelvic girdle- 2 coxae (hip bones)

18. 1. Pectoral Girdle • very light • allows for wide range of movement • poor shoulder stability • dislocations occur frequently • only attached at sternoclavicular joint

20. Clavicle • “little keys” • anchors many muscles • act like braces • when broken, entire shoulder collapses forward

22. Scapula • “spade or shovel” • aka shoulder blade

24. Bones of upper limbs: Humerus

25. Radius

26. Colle’s fracture

27. Ulna

28. Hand bones

29. 2. Pelvic Girdle • stable report for lower limbs • most of body weight is carried by pelvic girdle • provides support, protects bladder, parts of large intestine, and internal reproductive organs • 3 separate bones in infants- what are they? • fused into 1 in adults

30. Femur • longest and heaviest bone in body • very vascular; large amounts of blood loss when broken • when broken, many times a metal rod is put inside the hollow bone

34. Tibia • aka shin bone • bears major portion of body weight

35. Fibula • doesn’t bear ANY body weight or offer strength for leg • main fxn: point of attachment for muscles • can be used for bone grafting

36. Patella • knee cap

37. Bones of Foot

39. arches in foot enable the foot to support the weight of the body & provide leverage for walking • not rigid