2. Bones support and give shape to the body
Bones support and give shape to the body. This framework helps protect vital organs and furnishes attachment points for muscles, ligaments and tendons. Bones also store minerals and contain hematopoietic bone marrow.

3. Bone is a specialized form of connective tissue containing about 50% solid matter and 50% water.

4. Bone consists of a hard outer shell called compact bone and an inner spongy structure called cancellated or cancellous bone

5. The bone surfaces are covered by a tough fibrous vascular membrane called the periosteum.

7. The long bones grow in length at the ‘epiphysis’ (the ends of the developing bones)

8. Diaphysis (shaft)
Medullary cavity
epiphysis

9. Bones are classified according to their shape
Bones are classified according to their shape. Long Flat Short Irregular

10. The skeleton is divided into two main parts: the axial: including the skull, vertebral column, ribs and sternum the appendicular: including the limbs

11. The skull includes two major segments the cranium (brain case) and the facial bones. All skull bones are immobile except the mandible. The skull bones are united by sutures. Within the bones of the skull are hollows called sinuses. The function of the sinuses include, lessening the bone weight, providing chambers for vacalization and moistening and warming air.

12. Facial bone
Facial bone

14. Vertebrae
Vertebral Anatomy The horse has 37 vertebrae: * Cervical (neck)- 7 * Thoracic (chest) * Lumbar (lower back) - 6 (except in Arabs - 5) * Sacral (pelvis) - 5 (fused)
The dog has 31 vertebrae: * Cervical (neck)- 7 * Thoracic (chest) * Lumbar (lower back) - 7 * Sacral (pelvis) - 3 (fused)
The cat has 31 vertebrae: * Cervical (neck)- 7 * Thoracic (chest) * Lumbar (lower back) - 7 * Sacral (pelvis) - 3 (fused)

15. Cervicle vertebrae

16. C-1 and C-2 are called the atlas and the axis
C-1 and C-2 are called the atlas and the axis. The words atlas (holding up the world) and axis (what the world spins on) come from Greek mythology. There can be an instability in this area in large dogs that will cause neurologic problems. The cervical vertebrae are quite flexible, for obvious reasons.

17. As the cervical vertebrae become the thoracic vertebrae they go past the shoulder (S). The nerves that come off this cervical-thoracic junction at the shoulder are called the brachial plexus (you cannot see nerves on a plain radiograph). They innervate the front legs on each side. Each of the thoracic vertebrae corresponds to a rib (R) on each side of the chest

18. As we continue down the thoracic vertebrae you can visualize how high their dorsal spinal processes are. Also notice how these processes start to get smaller as we get closer to the lumbar vertebrae 

19. Moving towards the end of the thoracic vertebrae we come to what is termed the thoracolumbar (T-L) junction. It is a very common area to have VSC disease. As we pass into the lumbar vertebrae we have now made our way into the lower back 

20. The 7 lumbar vertebrae eventually lead into the sacral vertebrae (S)
The 7 lumbar vertebrae eventually lead into the sacral vertebrae (S). The fused sacral vertebrae are hard to visualize because they are within the pelvis. After the sacrum we are at the tail 

21. ribs

22. Forelimbs Front legs

23. Clavicle (collarbone) feline: a small flat bone attached to the scapula canine: a vestigial bone that is not attached to any other bone and may be absent in some dogs.

24. Scapula (shoulder blade)

26. Humerus the long bone extending from the shoulder to the elbow the humerus articulates with the scapula and the radius/ulna

28. humerus

29. Radius/Ulna Ulna: the caudle bone that articulates with the humerus at the olecranon Radius: the cranial bone that articulates with the humerus and ulna at the elbow

31. Carpus composed of 7 – 8 irregularly shaped bones in two rows
Carpus composed of 7 – 8 irregularly shaped bones in two rows. This joint is called the wrist in humans

32. Carpus

33. Metacarpus

34. Equine skeleton

35. Equine forelimb

36. Pelvis
ilium
ichium
pubis

37. Femur
femur

38. Knee Joint

40. Tibia/Fibula
tibia
fibula

41. Tarsus

42. Metatarsus

44. A joint is an articulation between bones, or between bones and cartilage.
They are classified by the degree of movement they permit

45. Synarthrosis: allow no movement
Fibrous tissue

46. Amphiarthrosis allow slight movement
Cartilaginous tissue

47. Diarthroses freely permit movement
Synovial joints
Hinge
Ball and socket
Gliding
Pivot
Condyloid

48. Joint capsule

49. Synovial membrane: lines the joint capsule and secretes synovial fluid

50. Joint cavity: the space between opposing surfaces of bones

51. Articular cartilage and disks

52. Bursae: sacs of connective tissue lined with synovial membrane filled with synovial fluid