Axial Skeleton - Human Anatom 8 Ph siolo Chapter 7 The...

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Unformatted text preview: Human Anatom 8: Ph siolo Chapter 7: The Skeleton The Axial Skeleton ' (Lb/wit skeleton is made of $06 named bones °Two subdivisions ofthe skeleton: — {1316M : Consists of 3'0 * bones found in the skull, vertebrae, git-13s, — a f gravid Mow : Consists of llé; limb bones ’A. The Siam 'Consists of craniaxl and gctciccl bonesli’l. bones in all) -Most skull bones are Hm: bones except the mobility) £3: - (free moveable joint) — Butt-mgfifl : Bones of adult skull are firmly united by interlocking joints called sutures. w »Major skull sutures: coronal, sagittal, squamous, lambdoid —1. Cranial Bones °a. R‘g‘fllfll Bone: (1) anterior portion‘of cranium 'b. %\i‘"i‘€/i“‘€A/( Bones: (2) cUrved, rectangular bones that form most of the superior and lateral skull; form bulk of cranial v’zfixtit —Sutures: 4 largest occur where the i221} x; 3-1? m ,3 bones articulate with other cranial bones: bones connect together : parietal bones meet (Dal/sh rift bones V“ max bone Wt mt . 'C. 0C5: gawk Bone: —Foramen fines ; f : at the base; inferior part of brain connects with spinal cord through this large hole TQMtZELx" 1 Bones: (2) lateral skull Bone: (1) butterfly-shaped bone —Considered keystone of cranium because it forms a cehtral wedge that Ok'fMtMiOd‘fiE‘; with all other cranial bones °f. EH4 wtaiqi Bone: (1) Forms anterior cranial fossajlies between sphenoid and nasal bones; area between nasal cavity and 0t bii‘E; —2. lift. Li {AA Bones '3. Maméiblg :(1)lowerjaw -d. —La rgest, H’CVLtéifeFal’ bone of the face °b.. meiflgg : (2)“ Saw; ;keystone bones offace —Form upper ’Ectw and central part of £49459.) skeleton (hard palate, orbits, and nasal cavity walls) -All F‘RCAQA bones (except mandible) articulate with maxillae 'c. 2% age/egg; Bones: (2) cheekbones; irregularly shaped °d. as <2:th Bones: '(2) rectangular, thin bones that form the bridge of the nose °e. 1&.Wimf?¢l Bones: (2) fingernail—shaped bones —Medial walls of ot‘mitts — Lamifvmoé fossa: houses lacrimal sac which allows {ears to . drain from the eye into the nasal cavity (lacrimaztears) 'f. {lymlgwtirxrgig Bones: (2) L-shapedbones; hard gamut-Q, ——Bony {DQE ofmouth l — Q4219:- palate results for improper fusion of bones °g. VWV‘JA’ : (1) slender, plow-shaped; lies in nasal cavity and forms part of nasal $464 (1ij -h. inferior Nasal . Canal/IQ : (2) thin, 6' my {216/ bones in nasal cavity —-Forms part of wall of Mgfi cavity —3 Auditory ”$6 Ede/'3 :Named for Sb Qgfi Mm i654 g (2): hammer-shaped '_IIIQIMS_ (2): anvil shaped ° $¥agfi>§ (2): stirrup— shaped —4. &QQ\ It Bone: (1) only bone that does not QH‘K IA @636, directly with another bone ‘Moveable base for low 636%; ;neck muscles allow for swallowing and speech ’3. The Vertebral Column °Also called the m, ' made of lé: irregular bones .Functions: —Surrounds and protects 3Q)“: Cék’i C6263“ and provides attachment points for r3b§ plus back and neck muscles, supports trunk, transmits weight ° Moveable: seven Catlin g" git (neck), twelve "6 mpg r (chest), and five (MI/WWW" (lower back) vertebrae dmmovable: 3:2ch m (five fused load— —bearing vertebrae) and COCLQX (four fused vertebrae forming a vestigial tail) °lntervertebral Discs: WSWWI Wig pad between vertebrae that absorb shock —lnnergelatinous nucleus git/II?) m3 (acts like a rubber ball, giving the disc its elasticity and compressibility); annulus ‘ L ‘3’; (ring of fibers) strong collar of collagen fibers and fibrocartilage — Warm CIA6‘ ,6; Disc: due to trauma to spine (heavy lifting) . >>Rupture of ;numbness or excruciating pain 'Vertebral Column Curvature —Forms ” Q5; ” shape —|ncreases l’efiI \i ‘2 VI (.2, and flexibility ofthe spine (functions as a spring rather than a {Ca ___) —1. Cervical Vertebrae7 (7 ) °C1—C7, smallest and l ny§a§§ vertebrae —C1= ” (Bettina-‘3 "; no body, no spinous process, essentially a ring of bone; ”carries' ’the skull, allows for” IAQ S "movement —C2=” Q {It} ”;body, spine, and other typical processes; allows for ” rIQ movement —2 Thoracic Vertebrae (12) T T31 'Articulate with (WIDE: —3. Lumbar Vertebrae (5) . (Ar 'Undermost fitiefa‘a 'sturdierstructure (large EQQIA ) -4. Sacrum (1) .Fused vertebrae; Q ’ $6 'Sacral I : anterosuperior margin of first sacral vertebrae, center of . gravity lies about 4, E m posterior ...
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