Location via proxy:   [ UP ]  
[Report a bug]   [Manage cookies]                
Jump to content

Editing Axis (anatomy)

You are not logged in. Your IP address will be publicly visible if you make any edits. If you log in or create an account, your edits will be attributed to a username, among other benefits.
Content that violates any copyrights will be deleted. Encyclopedic content must be verifiable through citations to reliable sources.
Latest revision Your text
Line 52: Line 52:
The centres for the arch appear about the seventh or eighth week of fetal life, while the centres for the body appear in about the fourth or fifth month.
The centres for the arch appear about the seventh or eighth week of fetal life, while the centres for the body appear in about the fourth or fifth month.


The dens, or odontoid process, consists originally of a continuation upward of the cartilaginous mass, in which the lower part of the body is formed.
The dens, or [[odontoid process]], consist originally of a continuation upward of the cartilaginous mass, in which the lower part of the body is formed.


During about the sixth month of fetal life, two centres make their appearance in the base of this process: they are placed laterally, and join before birth to form a conical bilobed mass deeply cleft above; the interval between the sides of the cleft and the summit of the process is formed by a wedge-shaped piece of cartilage.
During about the sixth month of fetal life, two centres make their appearance in the base of this process: they are placed laterally, and join before birth to form a conical bilobed mass deeply cleft above; the interval between the sides of the cleft and the summit of the process is formed by a wedge-shaped piece of cartilage.
Line 58: Line 58:
The base of the process is separated from the body by a cartilaginous disk, which gradually becomes ossified at its circumference, but remains cartilaginous in its center until advanced age.
The base of the process is separated from the body by a cartilaginous disk, which gradually becomes ossified at its circumference, but remains cartilaginous in its center until advanced age.


In this cartilage, rudiments of the lower [[epiphyseal plate]] of the atlas, and the upper epiphyseal plate of the axis may sometimes be found.
In this cartilage, rudiments of the lower epiphyseal lamella of the atlas and the upper [[Epiphyseal plate|epiphyseal]] lamella of the axis may sometimes be found.


The apex of the dens has a separate centre that appears in the second and joins about the twelfth year; this is the upper epiphyseal plate of the atlas.
The apex of the odontoid process has a separate centre that appears in the second and joins about the twelfth year; this is the upper epiphyseal lamella of the atlas.


In addition to these, there is a secondary centre for a thin epiphyseal plate on the undersurface of the body of the bone.
In addition to these, there is a secondary centre for a thin [[epiphysial plate|epiphyseal plate]] on the undersurface of the body of the bone.


==Clinical significance==
==Clinical significance==
By publishing changes, you agree to the Terms of Use, and you irrevocably agree to release your contribution under the CC BY-SA 4.0 License and the GFDL. You agree that a hyperlink or URL is sufficient attribution under the Creative Commons license.
Cancel Editing help (opens in new window)

Copy and paste: – — ° ′ ″ ≈ ≠ ≤ ≥ ± − × ÷ ← → · §   Cite your sources: <ref></ref>


{{}}   {{{}}}   |   []   [[]]   [[Category:]]   #REDIRECT [[]]   &nbsp;   <s></s>   <sup></sup>   <sub></sub>   <code></code>   <pre></pre>   <blockquote></blockquote>   <ref></ref> <ref name="" />   {{Reflist}}   <references />   <includeonly></includeonly>   <noinclude></noinclude>   {{DEFAULTSORT:}}   <nowiki></nowiki>   <!-- -->   <span class="plainlinks"></span>


Symbols: ~ | ¡ ¿ † ‡ ↔ ↑ ↓ • ¶   # ∞   ‹› «»   ¤ ₳ ฿ ₵ ¢ ₡ ₢ $ ₫ ₯ € ₠ ₣ ƒ ₴ ₭ ₤ ℳ ₥ ₦ № ₧ ₰ £ ៛ ₨ ₪ ৳ ₮ ₩ ¥   ♠ ♣ ♥ ♦   𝄫 ♭ ♮ ♯ 𝄪   © ® ™
Latin: A a Á á À à  â Ä ä Ǎ ǎ Ă ă Ā ā à ã Å å Ą ą Æ æ Ǣ ǣ   B b   C c Ć ć Ċ ċ Ĉ ĉ Č č Ç ç   D d Ď ď Đ đ Ḍ ḍ Ð ð   E e É é È è Ė ė Ê ê Ë ë Ě ě Ĕ ĕ Ē ē Ẽ ẽ Ę ę Ẹ ẹ Ɛ ɛ Ǝ ǝ Ə ə   F f   G g Ġ ġ Ĝ ĝ Ğ ğ Ģ ģ   H h Ĥ ĥ Ħ ħ Ḥ ḥ   I i İ ı Í í Ì ì Î î Ï ï Ǐ ǐ Ĭ ĭ Ī ī Ĩ ĩ Į į Ị ị   J j Ĵ ĵ   K k Ķ ķ   L l Ĺ ĺ Ŀ ŀ Ľ ľ Ļ ļ Ł ł Ḷ ḷ Ḹ ḹ   M m Ṃ ṃ   N n Ń ń Ň ň Ñ ñ Ņ ņ Ṇ ṇ Ŋ ŋ   O o Ó ó Ò ò Ô ô Ö ö Ǒ ǒ Ŏ ŏ Ō ō Õ õ Ǫ ǫ Ọ ọ Ő ő Ø ø Œ œ   Ɔ ɔ   P p   Q q   R r Ŕ ŕ Ř ř Ŗ ŗ Ṛ ṛ Ṝ ṝ   S s Ś ś Ŝ ŝ Š š Ş ş Ș ș Ṣ ṣ ß   T t Ť ť Ţ ţ Ț ț Ṭ ṭ Þ þ   U u Ú ú Ù ù Û û Ü ü Ǔ ǔ Ŭ ŭ Ū ū Ũ ũ Ů ů Ų ų Ụ ụ Ű ű Ǘ ǘ Ǜ ǜ Ǚ ǚ Ǖ ǖ   V v   W w Ŵ ŵ   X x   Y y Ý ý Ŷ ŷ Ÿ ÿ Ỹ ỹ Ȳ ȳ   Z z Ź ź Ż ż Ž ž   ß Ð ð Þ þ Ŋ ŋ Ə ə
Greek: Ά ά Έ έ Ή ή Ί ί Ό ό Ύ ύ Ώ ώ   Α α Β β Γ γ Δ δ   Ε ε Ζ ζ Η η Θ θ   Ι ι Κ κ Λ λ Μ μ   Ν ν Ξ ξ Ο ο Π π   Ρ ρ Σ σ ς Τ τ Υ υ   Φ φ Χ χ Ψ ψ Ω ω   {{Polytonic|}}
Cyrillic: А а Б б В в Г г   Ґ ґ Ѓ ѓ Д д Ђ ђ   Е е Ё ё Є є Ж ж   З з Ѕ ѕ И и І і   Ї ї Й й Ј ј К к   Ќ ќ Л л Љ љ М м   Н н Њ њ О о П п   Р р С с Т т Ћ ћ   У у Ў ў Ф ф Х х   Ц ц Ч ч Џ џ Ш ш   Щ щ Ъ ъ Ы ы Ь ь   Э э Ю ю Я я   ́
IPA: t̪ d̪ ʈ ɖ ɟ ɡ ɢ ʡ ʔ   ɸ β θ ð ʃ ʒ ɕ ʑ ʂ ʐ ç ʝ ɣ χ ʁ ħ ʕ ʜ ʢ ɦ   ɱ ɳ ɲ ŋ ɴ   ʋ ɹ ɻ ɰ   ʙ ⱱ ʀ ɾ ɽ   ɫ ɬ ɮ ɺ ɭ ʎ ʟ   ɥ ʍ ɧ   ʼ   ɓ ɗ ʄ ɠ ʛ   ʘ ǀ ǃ ǂ ǁ   ɨ ʉ ɯ   ɪ ʏ ʊ   ø ɘ ɵ ɤ   ə ɚ   ɛ œ ɜ ɝ ɞ ʌ ɔ   æ   ɐ ɶ ɑ ɒ   ʰ ʱ ʷ ʲ ˠ ˤ ⁿ ˡ   ˈ ˌ ː ˑ ̪   {{IPA|}}

Wikidata entities used in this page

Pages transcluded onto the current version of this page (help):