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Describe the bones that form the appendicular skeleton

Describe the bones that form the appendicular skeleton

Answers

Felix
Describe the bones that form the appendicular skeleton

•Bone:Pectoral girdle (scapular shoulder bone)

Structure:

-broad i,e flattened blade
-glenoid cavity to articulate with humerous
-metacronium/acromion for muscle attachment
-hard to provide support
-socket with cartilage/smooth surface to reduce friction

Function:

-support muscle attachment
-articulate with humerous

•Bone:Humerous

Structure:

-long shaft for muscle attachment
-round head to articulate with glenoid cavity
-trachlea for articulation with ulna
-olecranon fosa to prevent arm bending the other way

Function:

-movement
-muscle attachment

•Bone:Ulna and radius

Structure:

-ulna longer and on side of little finger
-has sigmoid notch and olecranon process to form hinge joint with humerous
-radius is smaller and lies along thumb side and does not join ulna.
-allows articulation with wrist bone

Function:

-movement
-muscle attachment

•Bone:pelvic girdle (hip bone)

Structure:

-composed of three fused bones ilium, ischium, pubis
-upper end fused to sacrum
-lower end has acetabalum for articulation with femur
-has abturator

Function:

-movement
-muscle attachment
-support
-absorbs pressure exerted by ground when animals move

•Bone:Femur

Structure:

-rounded head to fit in acetabalum of pelvis
-projections called trochanter for attachment of thigh muscles
-condyles at lower end for articulation with tibia
-patella that covers knee and prevent leg from bending backwards

Function:

-movement
-muscle attachment

•Bone:tibia and fibula

Structure:

-tibia is longer than fibula
-tibia is outer bone and fibula is inner bone
-tibia lies on the side of large toe
-fibula is fussed to tibia on (outer side)

Function:

-movement
-muscle attachment
Anganifelix answered the question on April 19, 2018 at 10:55

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