Skeletal System Flashcards
Internal framework of the human body. Where the muscular system is smoothly attached to, for the body to be able to move.
Skeletal System
What are the Functions of Skeletal System?
Protection
Support
Allows Body Movement
Blood Cell Production Storage of Minerals and Fats
Skeletal System is able to protect the different ______________ of the body.
internal organs
mostly responsible for blood cell production.
Bone marrow
What are the Body Parts Related to Skeletal System?
Bones
Ligaments
Cartilages
Joints
Type of connective tissue that protects and supports different body structures.
Bones
Bones provides structure for the?
skin
Bones Provides protection for internal organs and?
other different membrane systems
This type of bone is longer than they are wide.
Long Bones
Long bones are located in the upper and lower limbs such as?
Arms
Forearms
Thighs
Legs
This type of bone is relatively thin, flattened shape and are usually curved.
Flat Bones
Flat Bones are located in?
skull bones
ribs
breastbone (sternum)
shoulder blades (scapulae)
This type of bone is round or nearly cube-shaped.
Short Bones
Short Bones are located in?
wrist (Carpal bones)
ankle (tarsal bones)
This type of bone have shapes that don’t fit readily into the other three categories (long, fat, short).
Irregular Bone
Irregular bones are located in?
Vertebra
Facial Bones
This bone has less space than a spongy bone.
Composed of the outer layer of the bone.
Compact Bone
Compact Bone has more bone matrix. What does that mean?
Appears very dense and smooth.
This type of bone appears porous, has less bone matrix, and has more space than a compact bone.
Spongy Bone
Why does Spongy Bone appears porous?
Arranged in trabeculae.
honeycomb like little needles (Referring to cells).
Trabeculae
Stem cells that actively divide and are found in the periosteum (outer) and endosteum (inner).
Osteogenic Cells
Osteogenic Cells are the ________ of bone cells.
origin
Cells that compromise trabecula.
Osteoblast
Osteo = bone
Blast =
forming or building
Characteristics of Osteoblast
Uninucleated
Bone-building cells
Secrete the bone matrix
Provides the mitotic phase (actively divide). Provides nutrition and necessary supplies for bone growth. [Osteoblast]
Bone Matrix
For active mitosis. Result of active bone division. [Osteoblast]
Bone Growth
Primarily responsible for secretion of enzymes. Huge and multinucleated.
Osteoclast
breakdown or destruction.
Clast
Secretion of __________ responsible for breakdown or destruction of bone. [Osteoclast]
enzymes
Mature bone cells that monitor and maintain the bone matrix communicating this information to other cells.
Osteocyte
Meaning of Cyte
cells, so “bone cells.”
Repeating cylindrical units with an open canal at the center.
Osteon
Serves as an open region at the center containing blood vessels and fibers that serve the cells in the osteon.
Open Canal
Compact Bone is made up of Lamellae. What is that?
hollow tubes arranged like rings of the tree trunk
Extra tiny canals connecting lacunae (where chondrocytes are enclosed to)
Canaliculi
Fine, tiny gaps when lamellae, filled with osteocytes (mature bone cells).
Lacunae
This type of Lamellae makes up the circumference of diaphysis surrounding all osteons.
Circumferential
This type of Lamellae is “In between”. Fill in spaces between osteons.
Interstitial
Shaft of the bone.
Diaphysis
Part of the bone that develops from a center of ossification distinct from the diaphysis.
Epiphysis
Double-layered connective tissue membrane covering the outer surface of bone except where articular cartilage is present
Periosteum
Periosteum allows what to attach to the bone?
Ligaments and Tendons
________ and _______ from the periosteum supply the bone
blood vessels and nerves
the periosteum is where bone grown in __________.
diameter
What is Endosteum?
Thin connective tissue membrane lining the inner cavities of bone.
Thin layer of hyaline cartilage covering a bone where it forms a joint (articulation) with another bone
Articular Cartilage
Periosteum is doubled-layer. What are it?
First layer — made up of dense regular connective tissue.
Second layer — made up of fibers.
Purpose of periosteum
Attachment site of ligaments and tendons.
Area of hyaline cartilage between the diaphysis and epiphysis; cartilage growth followed by endochondral ossification results in growth in bone length.
Epiphyseal Plate
What is Spongy Bone?
Bone having many small spaces (porous); found mainly in the epiphysis; arranged into trabeculae.
Dense and smooth bone with few internal spaces organized into osteons; forms the diaphysis and covers the spongy bone of the epiphyses.
Compact Bone
Large cavity (space) within the diaphysis.
Medullary Cavity
Connective tissue in the spaces of spongy bone or in the medullary cavity; the site of blood cell production (RBCs, WBCs).
Red Marrow
What is Yellow Marrow?
Fat stored within the medullary cavity or in the spaces of spongy bone. (color of fat)
When we turn older, the epiphyseal plate becomes thinner because of?
ossification as it will be converted to epiphyseal line
The precise arrangement of compact and spongy bones depends on their?
bone types
Short, irregular, and flat bones have thin plates of spongy bone covered by?
compact bone
covers surfaces involved with joints
Hyaline cartilage
Long Bones contain a diaphysis (shaft of the bone) made up of thick compact bone surrounding the?
medullary cavity (space)
In long bones, the ends (epiphysis) containing the spongy bone inside the compact bone covered by cartilages is important for?
joint surfaces
What is the purpose of cartilages?
serve as a cushion and stress absorption.
Because of the ossification of the epiphyseal plates in young bone in turns into what in adult bone?
Epiphyseal line
disc of cartilage that grows during childhood.
Epiphyseal plate in juveniles
remnant of epiphyseal plates.
Epiphyseal lines in adults
outer covering, double layered, white membrane covering the exterior of bone consisting of outer layer.
Periosteum
This is the layer in periosteum where it’s composed of dense, irregular connective tissue.
Outer fibrous layer
This is the layer in periosteum where it’s osteogenic (stem cells), consist of primitive stem cells.
Inner layer
What is the function of periosteum?
Aside from covering, it also serves as an attachment site for a network of nerve fibers, blood vessels, which passes through the shaft to the medullary cavity.
inner layer; covers the internal spongy bone layer and canals that pass through compact bone.
Endosteum
Outside of bones will display different markings which can be:
Projections (protruding bones)
Depressions
Opening line
Foramina
Grooves
This division of Skeletal System comprises the head or torso.
Axial Skeleton
Axial Skeleton can also include _______ and ________.
spine and ribcage
Comprises the appendages and limbs (arms, legs, pelvis, shoulder)
Appendicular Skeleton
Functions as a protection and support of the brain.
Skull
Functions as a protection and support of the spinal cord.
Vertebral Column
Protects vital organs housed within the thorax (chest area).
Ribcage
What are the Bones in Axial Skeleton?
Skull
Vertebral Column
Ribcage
Other Associated Bones (Auditory Ossicles and Hyoid Bone)
Function to grasp and manipulate objects.
Upper Limbs
Example of upper limbs
Arm, forearm, hands
Permit body movement because they carry the whole body.
Lower Limbs
Attach the upper limbs to the body or with the thorax.
Pectoral girdle (Shoulder)
Attach the lower limbs to the body.
Pelvic Girdle
What are the Bones in the Appendicular Skeleton?
Upper Limbs
Lower Limbs
Pectoral Girdle (shoulder)
Pelvic Girdle
How many Skull Bones?
22
How many Associates Bones (Auditory Ossicles, Hyoid Bone)?
7
How many Vertebral Column Bones (Cervical to Sacral)?
26
How many bones in Rib Cages
25
How many bones in Girdle and Upper Limb Bones?
64
How many bones in Girdle and Lower Limb?
62
How many bones in Axial Skeleton?
80
How many bones in Appendicular Skeleton?
126
Toal number of bones in the Body.
206
Main part of the bone
Body
This part of the bone is enlarged, often rounded
Head