Gross Anatomy of Long Bones and axial skeleton

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Description and Tags

Using a sectioned real bone or plastic model identify the following parts of a bone. You will not be able to see all the features listed below on the plastic bones

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35 Terms

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  1. Epiphysis

  2. Epiphyseal plate

  3. Epiphyseal line

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Diaphysis (often referred to as “shaft”)

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  1. Medullary cavity

  2. articular cartilage

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  1. Endosteum

  2. Periosteum

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  1. Compact bone

  2. Spongy bone

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Long Bone

Longer than wide; cylindrical shaft (diaphysis) with two ends (epiphyses). Examples: humerus, radius, femur, tibia

<p>Longer than wide; cylindrical shaft (diaphysis) with two ends (epiphyses). Examples: humerus, radius, femur, tibia</p>
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short Bone

Small, cube-shaped; roughly equal length, width, and thickness. Provide stability with limited movement.

Key Examples

Examples: carpals (wrist), tarsals (ankle).

<p>Small, cube-shaped; roughly equal length, width, and thickness. Provide stability with limited movement.</p><p>Key Examples</p><p>Examples: carpals (wrist), tarsals (ankle).</p>
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flat bone

Thin, broad, often curved. Protects organs and offers wide muscle-attachment surface.

Structure: two layers of compact bone with spongy bone between, no true marrow cavity.

Examples: skull bones, sternum, ribs, scapula.

<p>Thin, broad, often curved. Protects organs and offers wide muscle-attachment surface. </p><p>Structure: two layers of compact bone with spongy bone  between, no true marrow cavity. </p><p>Examples: skull bones, sternum, ribs, scapula.</p>
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irregular Bone

Complex, irregular shape—doesn’t fit long/short/flat. Provide protection, support, and muscle attachment. Examples: vertebrae, sphenoid, ethmoid, some facial bones (e.g., mandible).

<p>Complex, irregular shape—doesn’t fit long/short/flat. Provide protection, support, and muscle attachment. Examples: vertebrae, sphenoid, ethmoid, some facial bones (e.g., mandible).</p>
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sesamoid Bone

Small, round bones that develop inside tendons where they pass over joints.

Function: Reduce friction, modify pressure, and increase mechanical leverage.

Example: Patella (kneecap) is the largest; others can occur in hands and feet.

<p>Small, round bones that develop inside tendons where they pass over joints. </p><p>Function: Reduce friction, modify pressure, and increase mechanical leverage. </p><p>Example: <strong>Patella</strong> (kneecap) is the largest; others can occur in hands and feet.</p>
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sutural or Wormian bone

Small, irregular bones that form within the sutures (joints) of the skull.

Function: Fill gaps and add stability between cranial bones.

Examples: tiny bones along the lambdoid suture (between parietal & occipital bones)

<p>Small, irregular bones that form within the sutures (joints) of the skull. </p><p>Function: Fill gaps and add stability between cranial bones. </p><p>Examples: tiny bones along the lambdoid suture (between parietal &amp; occipital bones)</p>
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Superoribtal foramen

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Frontal plate

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Occipital condyles

<img src="https://knowt-user-attachments.s3.amazonaws.com/66f755da-a68f-4285-991c-a8a8ad67c362.jpg" data-width="50%" data-align="center"><p></p>
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Zygomatic process and zygomatic arch

<p></p>
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Squamous portion of temporal bone

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Petrous portion *

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d. Mastoid process


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e. Styloid process


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f. External auditory meatus


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g. Carotid canal


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h. Internal auditory meatus


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i. Mandibular fossa


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j. Jugular foramen ( as part of articulated skull)


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* k. stylomastoid foramen


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5. Sphenoid bone


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. Ethmoid bone

a. Cribriform plate w/ olfactory foramina

b. Perpendicular plate

c. Crista galli

d. Ethmoidal sinuses (internal structure)

e. Middle nasal conchae

f. Superior nasal conchae

g. Orbital surface (of maxilla) (be able to identify bone from within orbit)


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Indraorbital foramen

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mandible

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Temporal process and zygomatic arch

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Coronal suture

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Sagittal suture

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Lambdoid suture

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Squamosal suture

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