Difference between Axial and appendicular skeleton
Answers
1.Axial, or axis, and appendicular skeleton are divisions of the skeletal system.
2.The axial skeleton comprises the bones that form the longitudinal axis of the body. The appendicular skeleton is composed of the bones of the limbs and girdles.
3.The axial skeleton is composed of the skull, the vertebral column, and the bony thorax.
4.The skull is formed by the cranial and facial bones. Eight cranial bones protect the brain: frontal, occipital, ethmoid, and sphenoid bones, and the pairs of parietal and temporal bones. The 14 facial bones are all paired (maxillae, zygomatics, palatines, nasals, lacrimals, and inferior nasal conchae), except for the vomer and mandible. The hyoid bone, not really a skull bone, is supported in the neck by ligaments.
5.The vertebral column is formed from 24 vertebrae, the sacrum, and the coccyx. There are 7 cervical vertebrae, 12 thoracic, and 5 lumbar vertebrae, which have common as well as unique features. Primary spinal curvatures present at birth are the thoracic and sacral curvatures; secondary curvatures (cervical and lumbar) develop after birth.
6.The bony thorax is formed from the sternum and 12 pairs of ribs. All ribs attach posteriorly to the thoracic vertebrae. Anteriorly, the first seven pairs attach directly to the sternum (true ribs); the last five pairs attach directly or not at all (false ribs). The bony thorax encloses the delicate organs.
7.The shoulder girdle, composed of two bones, the scapula and the clavicle, attaches the upper limbs to the axial skeleton.
8.The bones of the upper limbs include the humerus of the arm, the radius, and ulna of the forearm, the carpals, metacarpals, and the phalanges of the hand.
9.The pelvic girdle is formed by the two coxal bones, or hip bones. Each hip bone is the result of the fusion of the ilium, ischium, and pubis bones. The girdle receives the weight of the upper body and transfers it to the lower limbs. The female pelvis is lighter and broader than the male’s; its inlet and outlet are larger for childbearing.
10.The bones of the lower limbs include the femur of the thigh, the tibia and fibula of the leg, and the tarsals, metatarsals, and phalanges of the foot.
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Answer:
appendicular
Explanation:
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