kostra lebky

3. ledna 2011 v 16:46 | mia97
Lebka

Lebka (lat. cranium) je súčasť kostry stavovcov, ktorá predovšetkým chráni mozog. Je vytvorená z množstva lebečných kostí a je pohyblivo naviazaná na chrbticu. Zvyčajne na nej rozoznávame časť tvárovú a mozgovú (mozgovňu). Tvárová časť obsahuje vyústenia zmyslových orgánov a ústny otvor. Dutá mozgová časť chráni mozog.

Lebka človeka

Lebka patrí medzi kosti človeka, je kostrou hlavy. Lebka sa skladá z 22 kostí, ktoré sú spojené navzájom švami (lat. suturae), sánka (lat. mandibula) je pripojená k lebke pomocou 2 čeľustných kĺbov (lat. articulatio temporomandibularis = spánkovo - sánkový kĺb). Lebka sa delí na tvárovú a mozgovú časť (mozgovna) a tak sú delené aj kosti, ktoré ju tvoria:

•Tvárová časť (lat. splanchnocranium) - tvorí kostenú oporu pre začiatok tráviceho a dýchacieho ústrojenstva:
o nosová kosť (lat. os nasale)
o slzná kosť (lat. os lacrimale)
o dolná nosová mušľa (lat. concha nasalis inferior)
o lícna kosť (lat. os zygomaticum)
o podnebná kosť (lat. os palatinum)
o čeľusť (lat. maxilla)
o čerieslo (lat. vomer)
o sánka (lat. mandibula)

•Mozgová časť (lat. neurocranium) - delí sa na lebečnú spodinu (lat. basis cranii) a lebečnú klenbu (lat. calvaria alebo calva)
o záhlavná kosť (lat. os occipitale)
o spánková kosť (lat. os temporale)
o čelová kosť (lat. os frontale)
o čuchová kosť (lat. os ethmoidale)
o klinová kosť (lat. os sphenoidale)
o temenná kosť (lat. os parietale)

Vo vnútri lebky je lebečná dutina (lat. cavum cranii).






        
                

  

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