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Exercise 9

Skeleton, the body's framework, is constructed of two of the most supportive tissue found in the human body~cartilage and ~bone.

This is where the bones connect

Joints, or articulations

The Skeleton is subdivided into divsions:

1. axial
2. appendicular

Cartilages in the adult skeleton

Most important cartilages (7) are

1.articular cover the bones ends at movable joints
2.costal found connecting ribs to the sternum
3.laryngeal largely construct the larynx (voicebox)
4.trahcial and bronchial reinforce passages of the respiratory system
5.nasal support the external nose
6.intervertebral discs
7.supports the ears, epiglottis

Cartilage tissue is primarily composed of

water and is fairly resilient.

The dense connective tissue that covers catillage is called

perichondrium

Role of the perichondrium

acts to resist distortion of the cartilage when it is subjected to pressure and plays a role in cartilage growth and repair

Describe each
~Hyaline Cartilage
~Elastic Cartilage
~Fibrocartilage

~Hyaline, provides steady support with some resilience or give.
~Elastic, much more flexible than hyaline and resists repeated bending
~consists of rows of chondrocytes alternating with rows of thick collagen fibers.

10.

Classification of Bones

Texture: Compact or Spongy
Shape: Long, Short, Flat and Irregular

11.

Two subcatergories of Irregular bones:

1. sesamoid
2. wormian or sutural bones

12.

Bone Markings

13.

Parts of the Long Bone

Proximal epiphysis, diapiphysis, Distal epiphysis, epiphyseal plate or line, endosteum, medullary cavity,

14.

Microscopic Structure of the Bone

15.

The difference between Compact bone and Spongy bone

Spongy bone has a spiky, open-network appearance and compact bone is dense and homogeneous.

16.

Describe the Central (Haversian) Canal

Runs parallel to the long axis of the bone and carries blood vessels, nerves and lymph vessels through the bony matrix.

17.

Osteocytes

mature bone cells

18.

lacunae (chambers)

arranged in concentric circles (concentric lamellae)around the central canal.

19.

Osteon

A central canal and all the concentric lamellae surrounding it

20.

canaliculi

tiny canals radiating outward from a central canal to the lacunae of the first lamellae and then from lamella to lamella; forming a dense transportation network through the hard bone matrix.

21.

endochondral ossification and the major events of this process

uses hyaline cartilage"bones"as patterns for bone formation.
~The fibrous membrane covering the hyaline cartilage model is vascularized and coverted to a periosteum.
~Osteoblasts at the inner surface of the periosteum
secrete bone matrix around the hyaline cartilage model, forming a bone collar.
~Cartilage in the shaft center calcifies and then hollows out, forming an internal cavity.

22.

periosteal bud

(blood vessels, nerves, red marrow, elements, osteoblasts, and osteoclasts) invades the cavity, which becomes the medullary cavity.

23.

Which two sets of bone compose the skull?

1.Cranial
2.Facial

24.

Forming the superior, lateral, and posterior walls of the skull

cranial vault or calcaria

25.

Name the three distinct concavities

1.Anterior cranial fossa
2.Middle cranial fossa
3.Psoterior cranial fossa

26.

Anterior portion of the cranium; forms the forehead, superior part of the orbit, and the floor of the anterior cranial fossa

Frontal Bone

27.

What is the name of the opening above each orbit allowing blood vessels and nerves to pass?

Supraorbital foramen (notch)

28.

What is the Glabella?

Smooth area between the eyes

29.

Midline articulation point of the two parietal bones

Saggital suture

30.

The Parietal bone is

postlateral to the frontal bone, forming sides of the cranium

31.

Point of articulation point of parietals and frontal bones

Coronal Suture

32.

Inferior to parietal bone on later skull

Temporal Bone

33.

The frontal bone can be divided into four major parts:

squamous region, tympanic region, mastoid region, petrous region

34.

External Anatomy of the lateral aspect of the skull

35.

Inferior Region of the skull

36.

Point of articulation of the temporal bone with the parietal bone.

Squamous Suture

37.

A bridgelike projection joining the zygomatic bone (cheekbone) anteriorly. Together these two bones form the zygomatic arch.

Zygomatic Process

38.

Rounded depression on the inferior surface of the zygomatic process; forms the socket for the mandibular condyle, the point where the mandible joins the cranium.

mandibular fossa

39.

External Acoustic Meatus

canal leading to ear drum and middle ear

40.

Needle like projection inferirior to external acoustic meatus; attachment point for muscles and ligaments of the neck. This process is often broken off demonstration skulls.

Styloid Process

41.

Rough projection inferior and posterior to external acoustic meatus; attachment site for muscles. Full of air cavities and close to the middle ear---- a trouble spot for infections---- often becomes infected too a condition called__________.

Mastoid Process and Mastoiditis

42.

What is meningitis?

Inflammation of brain coverings

43.

Styloid foramen

Tiny opening between the mastoid and the styloid processes through which Cranial Nerve VII leaves the cranium.

44.

Opening medial to the styloid process through which the internal jugular vein and cranial nerves IX, X, and XI pass.

Jugular Formamen

45.

Most posterior bone of the cranium

Occipital Bone

46.

Opening medial to the styloid process through which the internal carotid artery passes into the cranial cavity.

Carotid Canal

47.

Opening on posterior aspect (petrous region) of temporal bone allowing passage of cranial nerves VII and VIII.

Internal Acoustic Meatus

48.

A jagged opening between the petrous temporal bone and the sphenoid providing passage for a number of small nerves and for the internal carotid artery to enter the middle cranial fossa(after it passes through part of the temporal bone).

Foramen Lacerum

49.

Internal anatomy of the inferior portion of the skull