bone classification

Question 1

how many bones

Answer 1

206, divided into 5 categories based on shapes

Question 2

long bones

Answer 2

• cylindrical in shape
• diameter smaller than its height
• found in arms, legs, fingers, toes
• act as levers, move when muscles contract

Question 3

long bones in arms

Answer 3

• humerus
• ulna
• radius

Question 4

long bones in legs

Answer 4

• femur
• tibia
  -fibula

Question 5

fingers long bones

Answer 5

• metacarpals, phalanges

Question 6

toe long bones

Answer 6

metatarsals, phalanges

Question 7

short bone

Answer 7

• cube like in shape
• ~ equal in length, width, thickness
• only short bones in the human skeleton are in carpals or wrists and tarsals in ankles
• provide stability and support, limited motion

Question 8

flat bones

Answer 8

• typically thin, often curved
• cranial bones of the skull, scapulae (shoulder blades), sternum, ribs

Question 9

irregular bones

Answer 9

• no characterized shape
• more complex shapes
• vertebrae that support spinal cord
• many facial bones (containing sinuses

Question 10

sesamoid bones

Answer 10

• small, round bone (shaped like a sesame seed)

Question 11

how do sesamoid bones form

Answer 11

• in the tendons : the sheaths of tissue that connect bones to muscles
• great deal of pressure generated in a joint

Question 12

what do sesamoid bones do

Answer 12

• protect tendons by helping them overcome compressive forces
• mainly in feet hands and knees