Axial skeleton


Axial skeleton

The axial skeleton consists of the 80 bones in the head and trunk of the human body. It is composed of five parts; the human skull, the ossicles of the inner ear, the hyoid bone of the throat, the chest, and the vertebral column. The axial skeleton and the appendicular skeleton together form the complete skeleton.

Overview

Protective or flat bones house the brain, spinal cord, and other vital organs. The purpose of the axial skeleton is to protect the body's most vital organs. All vertebrates have an axial skeleton. This article mainly deals with the axial skeletons of humans; however, it is important to understand the evolutionary lineage of the axial skeleton. The axial skeleton has 80 bones in it.

Skull

Skull (22)
* Cranial Bones (8)
** Parietal (2)
** Temporal (2)
** Frontal (1)
** Occipital (1)
** Ethmoid (1)
** Sphenoid (1)

* Facial Bones (14)illa (2)
** Zygomatic (2)
** Mandible (1)
** Nasal (2)
** Palatine (2)
** Inferior nasal concha (2)
** Lacrimal (2)
** Vomer (1)

Auditory Ossicles

Ossicles (6)
* Malleus (2)
* Incus (2)
* Stapes (2)

Hyoid bone

Hyoid bone (1)U-shape bone located in the neck. It anchors the tongue and is associated with swallowing.

Vertebral column

Vertebral Column (33)
* Cervical vertebrae (7)
* Thoracic vertebrae (12)
* Lumbar vertebrae (5)
* Sacrum (5) (fused)
* Coccyx (4) (fused, varies between 3-5)

Chest

Thoracic cage (25)
* Sternum (1)
* Ribs (24)

External links

* [http://www.botany.uwc.ac.za/sci_ed/grade10/manphys/axial.htm botany.uwc.ac.za]


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Look at other dictionaries:

  • axial skeleton — n the skeleton of the trunk and head * * * skeleton axiale [TA] the bones of the cranium, vertebral column, ribs, and sternum …   Medical dictionary

  • axial skeleton — n. in vertebrates, the skull, vertebral column, sternum, and ribs without the arms and legs …   English World dictionary

  • axial skeleton — noun the part of the skeleton that includes the skull and spinal column and sternum and ribs • Hypernyms: ↑skeletal structure • Part Holonyms: ↑endoskeleton • Part Meronyms: ↑sternum, ↑breastbone, ↑skull, ↑ …   Useful english dictionary

  • axial skeleton — noun Date: 1872 the skeleton of the trunk and head …   New Collegiate Dictionary

  • axial skeleton — bones in the axis of the body, comprising the neurocranium, the branchial skeleton, the vertebral column and the intermuscular bones and ribs …   Dictionary of ichthyology

  • axial skeleton — Anat. the skeleton of the head and trunk. [1870 75] * * * …   Universalium

  • axial skeleton — ax′ial skel′eton n. anat. the skeleton of the head and trunk • Etymology: 1870–75 …   From formal English to slang

  • extra-axial skeleton — (PORIFERA) Skeletal elements that surround or arise from an axial region …   Dictionary of invertebrate zoology

  • Axial — Ax i*al, a. 1. Of or pertaining to an axis; of the nature of, or resembling, an axis; around an axis. [1913 Webster] To take on an axial, and not an equatorial, direction. Nichol. [1913 Webster] 2. (Anat.) Belonging to the axis of the body; as,… …   The Collaborative International Dictionary of English

  • Axial line — Axial Ax i*al, a. 1. Of or pertaining to an axis; of the nature of, or resembling, an axis; around an axis. [1913 Webster] To take on an axial, and not an equatorial, direction. Nichol. [1913 Webster] 2. (Anat.) Belonging to the axis of the body; …   The Collaborative International Dictionary of English


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