skeletal system skeletal system functions provides shape and support. video notes anatomy skeletal...
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Skeletal System
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Skeletal System Functions Provides shape and support.
Video Notes Anatomy Skeletal System Support
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Skeletal System Functions Enables you to
move. Skeletal muscles,
which are attached to bones by tendons, pull on the bones to produce movement.
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Skeletal System Jobs Protects your internal organs. Your heart and lungs are shielded by
your ribs. Your brain is protected by your skull. Your spinal cord is protected by your
vertebral column.
Video Notes Anatomy Skeletal System Bones Protect
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Skeletal System Jobs Produces blood cells. Some of your bones are filled with
special material that makes red and white blood cells.
Video Notes Anatomy Skeletal System Bones Make Blood
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Skeletal System Jobs Stores minerals, fats, and other
substances.
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Types of Bone Compact bone: has no visible
open spaces and provides most of the strength and support for a bone.
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Types of Bone Spongy bone: has many open spaces
which makes the bone light, but strong.
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Bone Marrow Bone marrow is a soft tissue found
inside the bones that makes red blood cells and stores fat.
Video Notes Anatomy Skeletal System Bone Types
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Cartilage Cartilage- soft, flexible tissue that is
part of the skeletal system. Makes up the nose and ears, and helps cushion the area where two bones meet.
Video Notes Anatomy Skeletal System Cartilage
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Joints Joints- the place where two or more
bones connect and allow for movement.
Video Notes Anatomy Skeletal System Types of Joints
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Joints or “Articulations” Articulation = place where two bones
come together Classification methods:
Function: Synarthrosis (non-movable) Amphiarthrosis (slightly movable) Diarthrosis (freely movable)
Structure (connective tissue type): Fibrous (fibrous tissue) Cartilaginous (cartilage) Synovial (synovial fluid)
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1. Fibrous joints• No movement• Sutures in fetal skull
2. Cartilaginous joints• Slight movements• Epiphyseal plates, costal cartilage
3. Synovial joints • Free movements• Most joints (wrist, knee, shoulder, hip, etc.)
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Fibrous Joints
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Synovial Joints
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Ball and Socket Joint Ball and Socket Joint: allow the
greatest range of motion, like your shoulder and hip.
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Hinge Joint Hinge Joint: like the hinge of a door,
allows forward or backward motion.
Knee Joint Elbow Joint
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Pivot Joint Pivot Joint: allows one bone to rotate
around another, neck and head.
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Sliding Joint Sliding Joint: allows one bone to slide
over another, wrist and ankles.
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Types of Joint Movements1. Flexion vs. extension2. Plantar flexion vs. dorsiflexion3. Abduction vs. adduction4. Pronation vs. supination5. Eversion vs. inversion6. Rotation7. Protraction vs. retraction8. Elevation vs. depression9. Circumduction10.Excursion (mandible moving side to side)11.Opposition vs. reposition (thumb & pinky together,
then apart)
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Bone to Bone Ligaments- connects bone to bone.
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Bone to Muscle Tendons- connects muscle to bone.
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Divisions of the Skeleton Axial skeleton
Skull Hyoid bone Vertebral column Thoracic (rib) cage
Appendicular skeleton Limbs Girdles
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Axial skeleton 1. Skull (28 bones including auditory ossicles) 2. Hyoid bone (1 bone) 3. Vertebral column (26 bones) a. Cervical (7 vertebrae) b. Thoracic (12 vertebrae) c. Lumbar (5 vertebrae) d. Sacrum (1 – 5 fused vertebrae) e. Coccyx (1 -~4 fused vertebrae) 4. Thoracic Cage (25 bones)
a. Ribs (24)b. Sternum (1 – 3 parts)
80 total bones in axial skeleton
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The Skull – 28 bones Braincase – encloses
cranial cavity Surrounds & protects brain
6 bones, 8 when paired
Facial bones – forms facial structure
8 bones, 14 when paired
Auditory ossicles – form the middle ear These bones transmit vibration
to eardrum Malleus, incus, & stapes
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Hyoid bone
U-shaped Not part of skull No direct bony attachment
to skull (attached by muscles & ligaments)
Attachment site for tongue & larynx muscles (speech & swallowing)
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Vertebral Column “Backbone” Central axis of skeleton 5 regions:
Cervical vertebrae (neck + to turn) (C1-C7) Thoracic vertebrae (T1-T12) Lumbar vertebrae (L1-L5) Sacral (S) Coccygeal bone (CO)
4 curves: Cervical curves anteriorly Thoracic curves posteriorly Lumbar curves anteriorly Sacral & coccygeal curve posteriorly
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Functions of Vertebral Column Supports weight of head & trunk Protects spinal cord Allows spinal nerves to exit spinal cord Site for muscle attachment Permits head & trunk movement
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Vertebral Column “Backbone” Central axis of skeleton 5 regions:
Cervical vertebrae (neck + to turn) (C1-C7) Thoracic vertebrae (T1-T12) Lumbar vertebrae (L1-L5) Sacral (S) Coccygeal bone (CO)
4 curves: Cervical curves anteriorly Thoracic curves posteriorly Lumbar curves anteriorly Sacral & coccygeal curve posteriorly
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Vertebral Column Defects Lordosis –
abnormal anterior curvature Lumbar Swayback
Kyphosis – abnormal posterior curvature Usually upper thoracic Hunchback
Scoliosis – abnormal lateral curvature
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Vertebral Column Damage
Herniated disk Compresses nerves
“Broken Tailbone” Fractured coccyx Can occur during
childbirth and from falls
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Thoracic Cage “Rib cage” Functions:
Protects vital organs in thorax Prevents collapse of thorax during respiration
Consists of: Thoracic vertebrae Ribs + associated cartilages Sternum
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Ribs & Costal Cartilages 12 pairs (24 total) Articulate with thoracic vertebrae True ribs – (1-7) superior 7 attach to sternum via cartilage False ribs – (8-12) inferior 5 do not directly attach to sternum
Floating ribs – (11-12) inferior 2 not attached to sternum at all
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Sternum “Breastbone” Three parts:
Manubrium (handle) Jugular notch – superior to
manubrium; between clavicular articulations
Body Sternal angle – at junction of
manubrium & body; locates 2nd rib & used to find apex of heart
Xiphoid process (sword) Used in CPR alignment
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Appendicular Skeleton
Girdles Pectoral or shoulder Pelvic
Upper Limbs Arm Forearm Wrist Hand
Lower Limbs Thigh Leg Foot
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Pectoral Girdle
2 scapulae Articulates with
humerus 2 clavicles
Articulates with sternum & scapula
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Pelvic Girdle
2 coxae Coxa formed by 3 fused bones: ilium, ischium,
pubis Sex differences: larger pelvic inlet and outlet in
females, broader pelvis in females, greater subpubic angle in females (childbirth)
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Comparison of the Male and Female Pelvis
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Upper Limb
Arm Forearm Wrist Hand
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Upper Limb: Arm Humerus –
region between shoulder and elbow
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Upper Limb: Forearm
Radius (lateral or thumb side) & Ulna (medial or little finger side)
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Upper Limb: Wrist & Hand Wrist – region between
forearm and hand 8 carpals
Hand – attached to carpals 5 metacarpals 5 digits 3 phalanges per finger (2
on thumb)
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Lower Limb
Thigh Leg Ankle Foot
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Lower Limb: Thigh
Femur – region between hip and knee Articulates with
coxa and tibia Patella
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Lower Limb: Leg
Tibia (shin) and fibula
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Lower Limb: Foot & Ankle Ankle = 7 tarsals; articulates with tibia &
fibula; calcaneus forms heel Foot = 5 metatarsals; 3 phalanges per digit
(except great toe – has 2)