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C.Skeletal System.Pdf Skeletal System Skeletal Anatomy bones, cartilage and ligaments are tightly joined to form a strong, flexible framework each individual bone is a separate organ of the skeletal system bone is active tissue: !5-7% bone mass/week ~270 bones (organs) of the Skeletal System Functions of Skeletal System: with age the number decreases as bones fuse 1. Support by adulthood the number is 206 (typical) strong and relatively light; 20% body weight 2. Movement even this number varies due to varying numbers framework on which muscles act of minor bones: act as levers and pivots sesamoid bones – small rounded bones that form within 3. Protection tendons in response to stress brain, lungs, heart, reproductive system eg. kneecap (patella), in knuckles 4. Mineral storage (electrolyte balance 99% of body’s calcium is in bone tissue wormian bones –bones that form within the sutures of (1200-1400g vs <1.5g in blood, rest in cells) skull also stores phosphate each skeletal organ is composed of many kinds of 5. Hemopoiesis tissues: blood cell formation bone (=osseous tissue) 6. Detoxification cartilage bone tissue removes heavy metals and other foreign materials fibrous connective tissues from blood blood (in blood vessels) can later release these materials more slowly for excretion nervous tissue but this can also have bad consequences General Shapes of Bones Human Anatomy & Physiology: Skeletal System; Ziser, Lecture Notes, 2010.4 1 Human Anatomy & Physiology: Skeletal System; Ziser, Lecture Notes, 2010.4 2 bones can be categorized according to their general the general structure of a typical longbone: shape: 1. long: cylindrical, longer than wide articular cartilage rigid levers for muscle actions eg crowbars epiphysis periosteum eg. arms, legs, fingers, toes medullary cavity diaphysis 2. short: length nearly equal width endosteum limited motion, gliding if any epiphysis eg. carpals, tarsals, patella 3. flat: thin sheets of bone tissue epiphyses enclose and protect organs large surface area for muscle attachment and pivot broad surfaces for muscle attachments spongy bone with trabeculae; eg. sternum, ribs, most skull bones, scapula, os coxa contains red marrow (=hemopoietic tissues) 4. irregular: elaborate shapes different from above ! produces blood cells in delicate mesh of reticular tissues eg. vertebrae, sphenoid, ethmoid in adults red marrow is limited to vertebrae, sternum, ribs, pectoral and pelvic girdles, proximal heads of Bone Structure humerus and femur bones have outer shell of compact bone with age, red marrow is replaced by yellow marrow usually encloses more loosely organized bone tissue articular cartilage = spongy (=cancellous) bone on surface of epiphyses Human Anatomy & Physiology: Skeletal System; Ziser, Lecture Notes, 2010.4 3 Human Anatomy & Physiology: Skeletal System; Ziser, Lecture Notes, 2010.4 4 resilient cushion of hyaline cartilage highly organized arrangement of matrix and cells diaphysis lacunae w osteocyte thick compact bone but light; hollow ! medullary cavity & canaliculi medullary cavity lamellae yellow marrow – fat (adipose) storage haversian canal “fat at the center of a ham bone” perforating canals (Volkmann canals) interconnect the haversian canals in event of severe anemia, yellow marrow can transform back into red marrow to make blood cells periosteum provides life support system for periosteum bone cells white fibrous connective tissue continuous with tendons penetrates bone – welds blood vessels to bone blood vessels penetrate bone and connect with those in haversian canals endosteum fibrous CT that lines medullary cavity B. cartilage Microscopic Structure (Histology) resembles bone: large amount of matrix A. bone: lots of collagen fibers connective tissue; contains cells and matrix differs: firm flexible gel is not calcified (hardened) bone cells = osteocytes no haversian canal system no direct blood supply matrix predominates; ~ 1/3rd organic and ! nutrients and O2 by diffusion 2/3rd’s inorganic all bone starts out as cartilage matrix contains lots of collagen fibers Human Anatomy & Physiology: Skeletal System; Ziser, Lecture Notes, 2010.4 5 Human Anatomy & Physiology: Skeletal System; Ziser, Lecture Notes, 2010.4 6 in bone the matrix is hardened (= ossified) by Anatomy of Skeletal System calcification (or mineralization) microscopic structure of cartilage: Bone Markings: any bump, hole, ridge, etc on each bone; eg.: chondrocytes in lacunae Foramen: opening in bone – passageway for nerves and blood vessels kinds of cartilage: (all similar matrix with lots of collagen Fossa: shallow depression – eg a socket into which another bone fibers; differ in other fibers) articulates Sinus: internal cavity in a bone 1. hyaline most common Condyle: rounded bump that articulates with another bone eg. covers articular surfaces of joints, costal cartilage of ribs, rings of tracheae, nose Tuberosity: large rough bump – point of attachment for muscle 2. fibrous Spine: sharp slender process mostly collagen fibers eg. discs between vertebrae, pubic symphysis two main subdivisions of skeletal system: 3. elastic axial : skull, vertebral column, rib cage also has elastic fibers eg. external ear, eustacean tube appendicular: arms and legs and girdles The Axial Skeleton A. Skull most complex part of the skeleton consists of facial and cranial bones most bones are paired, not all Human Anatomy & Physiology: Skeletal System; Ziser, Lecture Notes, 2010.4 7 Human Anatomy & Physiology: Skeletal System; Ziser, Lecture Notes, 2010.4 8 in 4 of the bones making up the face bones joined at sutures in life lined with mucous membrane to form sinuses 1. Fontanels lighten bone, warm and moisten air ossification of skull begins in about 3rd month of 6 sinuses: fetal development frontal -2 maxillary -2 ethmoid -1 not completed at birth!bones have not yet fused sphenoid -1 gaps = fontanels Examples of Paired Skull Bones: frontal (anterior) occipital (posterior) 5. Maxilla 2 sphenoid 2 mastoid cheek bones, upper teeth cemented to these bones at this stage skull is covered by tough membrane for protection hard palate: palatine process and palatine bones normally, bones grow together and fuse to form solid case around brain cleft palate ! when bones of palatine process of maxilla bones do not fuse properly 3. Skull Cavities not only cosmetic effect inside of skull contains several significant cavities: can lead to serious respiratory and feeding problems in babies and small children today, fairly easily corrected cranial cavity – largest (adult – 1,300 ml); part of dorsal body cavity orbits – eye sockets 6. Temporal Bone nasal cavity external auditory meatus - opening to ear canal leads to middle ear chamber buccal cavity ear ossicles: middle and inner ear cavities malleus = hammer 4. Paranasal Sinuses incus = anvil stapes = stirrup Human Anatomy & Physiology: Skeletal System; Ziser, Lecture Notes, 2010.4 9 Human Anatomy & Physiology: Skeletal System; Ziser, Lecture Notes, 2010.4 10 7. Mandible = lower jaw very delicate and easily damaged by sharp upward blow to the nose largest, strongest bone of face articulates at temporal bone can drive bone fragments through the cribriform plate into the meninges or brain itself Examples of Unpaired Skull Bones: can also shear off olfactory nerves! loses of smell 8. occipital bone 11. hyoid bone – single “U” shaped bone in neck just below mandible foramen magnum - large opening in base through which spinal cord passes suspended from styloid process of temporal bone occipital condyles - articulation of vertebral column only major bone in body that doesn’t directly articulate with other bones 9. sphenoid bone – irregular, unpaired bone serves as point of attachment for tongue and several other muscles resembles bat or butterfly; “keystone” in floor of cranium B. Vertebral Column ! anchors many of the bones of cranium main axis of body contains sinuses flexible rather than rigid sella turcica – depression for the pituitary gland permits foreward, backward, and some sideways 10. ethmoid – irregular, unpaired bone movement honeycomed with sinuses divided into 5 regions: cribiform plate – perforated with openings which cervical allow olfactory nerves to pass thoracic lumbar nasal conchae – passageways for air; filtering, sacral warming, moistening coccygeal crista galli – attachment of meninges all but last two are similar in structure: Human Anatomy & Physiology: Skeletal System; Ziser, Lecture Notes, 2010.4 11 Human Anatomy & Physiology: Skeletal System; Ziser, Lecture Notes, 2010.4 12 body sacroiliac joint – lots of stress spinous process vertebral foramen Coccyx (4-5, some fused): transverse process superior and inferior articular process intervertebral foramen between each pair tailbone separated by intervertebral discs painful if broken Cervical (7): sometimes blocks birth canal, must be broken have transverse foramena C. Ribcage 1s t and 2nd are highly modified for movement: manubrium atlas – holds head up sternum body (=gladiolus) no body or spinous process xiphoid process “yes” movement of head ribs: most joined to sternum by costal cartilages axis -- dens (odontoid process) – forms pivot “no” movement true ribs (7prs) Thoracic (12): false ribs (5 prs) include floating ribs (2prs) distinguished by facets smooth areas for articulation of ribs each rib articulates at two places one on body of vertebrae one on transverse process Lumbar (5): short and thick spinous processes modified for attachment of powerful back muscles Sacrum (5 fused): triangular bone formed from fused vertebrae Human Anatomy
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