Skeletal System Flashcards
Functions of SKELETAL system
✓ Support ✓ Protection ✓ Movement ✓ Storage for Mineral (mainly) • especially CALCIUM and PHOSPATE ✓ Blood production (Hematopoiesis) ✓ Fat storage
Most calcium in our body stores in?
✓ Bone tissues
Blood production @?
Fat storage @?
✓ RED bone marrow
• Hematopoiesis (blood production)
✓ YELLOW bone marrow
• FAT storage
How many bones in adult?
How many axial and appendicular bones?
How many skull bones?
How many facial and cranial bones?
✓ 206 bones
• 22 SKULL bones
° 14 FACIAL bones
° 8 CRANIAL bones
✓ 80 axial bones (central/gitna/axis)
✓ 126 appendicular bones
Weakest point in the skull?
✓ PTERION
• WEAKEST point in skull
• mabilis madamage
Pterion is made up of what bones?
Asterion is made up of?
✓ PTERION (PFST) • Parietal • Frontal • Sphenoid • Temporal
✓ ASTERION (TOP)
• Temporal
• Occipital
• Parietal
Bones of newborn
Bones of adult
Skeletal muscles of adult
✓ 270-350 bones in NEWBORN (not definite).
✓ 206 BONES in ADULT
✓ 650 SKELETAL muscles in ADULT
Types of bones
✓ Long bones ✓ Short bones ✓ Flat bones ✓ Irregular bones ✓ Sesamoid bones
Limbs is what type of bones
✓ Long bones - Limb
Carpals is what type of bone
Mnemonics for proximal and dstal row
✓ Short bones - Carpal
Stop Letting Those People
Touch The Cadaver’s Hand
(Proximal to Distal row) ; (Lateral to Medial) PDLM
PROXIMAL Row ✓ Scaphoid ✓ Lunate ✓ Triquetrum ✓ Pisiform
DISTAL Row ✓ Trapezium ✓ Trapezoid ✓ Capitate ✓ Hamate
Tarsal mnemonics
Tall Centers Never Take Shots From Coners
✓ Talus ✓ Calcaneus ✓ Navicular ✓ Third Cuneiform ✓ Second Cuneiform ✓ First Cuneiform ✓ Cuboid
Tiger Cubs Need MILC ✓ Talus ✓ Calcaneus ✓ Navicular ✓ Middle Cuneiform ✓ Intermediate Cuneiform ✓ Lateral Cuneiform ✓ Cuboid
Examples of flat bones ( Give 4)
Flat bones (SSSR) ✓ Scapula ✓ Sternum ✓ Skull ✓ Ribs
Samples of irregular bones (give 1)
Irregular bones
✓ Vertebrae
How many vertebrae in adults and children
How many sacrum and coccyx in children
✓ 26 adults
✓ 33 children because of Sacrum and Coccyx
✓ Sacrum - 5
✓ Coccyx - 4
Type of bone that grows in a tendon or a ligament
✓ Sesamoid bone
• type of bone that grows in a tendon or ligament
• PATELLA
Patella is what tyoe of bone?
✓ PATELLA - SESAMOID BONE
Spongy bone that is sandwich by compact bone?
✓ DIPLOE
• Spongy bone that is sandwich by compact bone?
Best example of diploe?
DIPLOE
✓ FLAT BONES of SKULL
Sternal angle is what type of cartilage?
✓ Sternal angle - FIBROCARTILAGE
Cells found in bone tissues
✓ Osteogenic / Osteoprogenitor cells
✓ Osteoblasts
✓ Osteocytes
✓ Osteoclasts
Only bone cell that can undergo CELL DIVISION / MITOSIS
✓ OSTEOGENIC or OSTEOPROGENITOR cells
• bone stem cell that undergo MITOSIS
• only bone cell that can undergo cell division
• SOURCE of NEW BONE
• found along PERIOSTEUM and ENDOSTEUM
If bone is detach from periosteum, would you remove it or preserve?
✓ If bone is DETACH from PERIOSTEUM
• REMOVE it bc it will lead to NECROSIS
✓ If bone is still ATTACHED to PERIOSTEUM,
• you can PRESERVE / OBSERVE
Bone cell for bone formation / deposition
✓ Osteoblast
• for bone formation or deposition
• came from OSTEOGENIC CELLS
*Osteogenic cells transform into Osteoblast
Secretes bone matrix called osteoid
✓ Osteoblasts
• for bone formation or deposition
• came from OSTEOGENIC CELLS
• secretes BONE MATRIX called OSTEOID
• synthesize and secrete COLLAGEN fibers and MINERALS
Bone matrix
✓ OSTEOID
• bone matrix
• semi-fluid material
OB ; Osteoid ( may fluid ) ; then CALCIUM and PHOSPHATE will go to osteoid ——-> then it will become BONE
What is the difference between osteoid and bone?
✓ Bone is HIGHLY mineralized ; Osteoid is non-mineralized
Mature bone cells/osteoblast that maintains the bone
✓ OSTEOCYTES
• Mature bone cells/osteoblast that maintains the bone
Osteocytes is found in space called?
Osteoclasts is found in space called?
✓ Osteocytes - LACUNAE
✓ Osteoclast - HOWSHIP’S LACUNAE
Phagocytes or macrophage of bone
✓ Osteoclasts
• Phagocytes or macrophage of bone
• for bone DESTRUCTION or bone RESORPTION
• found in HOWSHIP’S LACUNAE
Strongest form of bone
✓ Compact bone
• strongest form of bones
Spongy bone other term
✓ Spongy bone
• Trabecullar bone / Spongy bone
Found @ center of haversian system or osteon?
✓ Haversian canal ✓ Neurovasvular Bundle ✓ Blood vessels ✓ Nerves ✓ Arteris
Immature bone that is fibrous is called?
As the bone matures, it will become?
✓ WOVEN bone
• immature bone that is fibrous
• ⬆️ FIBERS ; ⬇️ minerals
• assoc. with CHILDREN
✓ LAMELLAR bone
• ⬇️ fibers ; ⬆️ MINERAL
• As the bone matures, nagigin lamellar
• Adults
Canals perpendicular to haversian canal (2 terms)
✓ VOLKMANN’S canal or
✓ PERFORATING canal
• canal perpendicular to haversian canal
Other name for alveolar bone proper?
✓ Bundle bone or
✓ CRIBRIFORM plate
Bone immediately adjacent to the roots of tooth
Clinically (3 terms)
Radiographically
✓ Alveolar bone proper or Bundle bone or Cribriform plate
✓ Lamina Dura - RO
Dental condition assoc. With absence of lamina dura?
Medical condition assoc. With absence of lamina dura?
✓ Periodontitis
• xxx Lamina dura
✓ HYPERPARATHYROIDISM
• xxx lamina dura
Hyperparathyroidism
Hyperparathyroidism
• ⬆️ Parathyroid hormone
• ⬆️ blood calcium levels
• excessive calcium
Eh yung PTH, nag-iinduce siya ng bone resorption. Kumbaga sa bone kukunin yung calcium para dumami calcium sa blood.
So ang nangyayari nalulusaw yung bone or yung lamina dura
Bony plate underlying periosteum and endosteum
✓ CIRCUMFERENTIAL LAMELLA
• bony plate underlying periosteum and endosteum
Outer or Inner Circumferential lamellae
Lines the medullary cavity or bone marrow cavity
Peneterated by sharpey’s fibers
✓ CIRCUMFERENTIAL LAMELLA
• bony plate underlying periosteum and endosteum
✓ OUTER CL
• Peneterated by sharpey’s fibers
• immediately adjacent sa tooth
✓ INNER CL
• Lines the medullary cavity or bone marrow cavity
• medyo paloob na ng bone marrow cavity
Ligament embedded within the bone
✓ Sharpey’s fibers
•Ligament embedded within the bone
Nakikita sa OUTER CL
Characteristics of sharpeys fiber?
Sharpey’s fiber
• HIGHLY MINERALIZED ligament bc nasa bone so nakakakuha siya mineral sa bone
Parts of long bone
✓ Diaphysis ✓ Epiphysis ✓ Metaphysis ✓ Articular cartilage ✓ Periosteum ✓ endosteum ✓ Medullary cavity
Shaft of long bone
END of long bone
Part of long bone that contains bone marrow
✓ DIAPHYSIS - SHAFT
✓ EPIPHYSIS
• END of long bone
• Part of long bone that contains BONE MARROW
B/w diaphysis and epiphysis
✓ METAPHYSIS
Articulating surface ; creates contact to another bone
✓ ARTICULATING cartilage
• creates contact to ANOTHER bone
• articulating surface
Source of osteoprogenitor cellls
Lining of medullary cavity
✓PERIOSTEUM and ENDOSTEUM
• Source of OSTEOPROGENITOR cells
✓ PERIOSTEUM
• DENSE irregular tissue
• Source of OSTEOPROGENITOR cells
✓ ENDOSTEUM
• Lining of medullary cavity
• source of osteoprogenitor cells
Medullary cavity or marrow cavity contains
✓ RED bone marrow ( FETUS)
✓ YELLOW bone marrow (ADULTS)
Extractin of max. 3rd molar (8). Fracture of max tuberosity. Fractured bone is attached to periosteum. What is TOC?
✓ STABILIZED the bone using SUTURES
since still attached pa
Age of organism from day of fertilization –> implantation
Day of implantation —> 8 weeks of development
8 weeks —> birth
✓ Zygote
• Age of organism from day of fertilization –> implantation
✓ Embryo
• Day of implantation —> 8 weeks of development
✓ Fetus
• 8 weeks —> birth
Blood production?
✓ Hematopoiesis
Site of hematopoiesis for EMRYO?
Site of hematopoiesis for FETUS?
Site of hematopoiesis after BIRTH?
✓ YOLK SAC ; BLOOD ISLANDS
• Hematopoiesis of EMRYO
✓ LIVER ; also SPLEEN and LYMPH NODE
• Hematopoiesis of FETUS
✓ RED BONE MARROW
• after BIRTH
*As we grow old, yung RED bone marrow sa long bones nagiging YELLOW bone marrow
Main bones inv. hematopoiesis in children?
Main bones inv. hematopoiesis in adults?
✓ LONG BONES
• children
✓ PELVIS ✓ SKULL ✓ STERNUM ✓ VERTEBRA • adult
2 types of bone formation
✓ Intramembranous
✓ Endochondral
Indirect bone growth
Direct bone growth
Intramembranous or Endochondral
Bones that are FIRST to be formed? I or E?
✓ INTRAMEMBRANOUS
• DIRECT bone growth
• Bone stem cells directly transforms into bone
• Bones that are FIRST to be formed
✓ ENDOCHONDRAL
• INDIRECT bone growth - begins with cartilage b4 becoming bone
• HYALINE CARTILAGE muna then bone
What cartilage transforms into bone tissue?
✓ HYALINE CARTILAGE
• cartilage that transforms into bone tissue
• like epiphyseal plate
What is the first bone to form in the human body?
Intramembranous or Endochondral
What is the very first bone to form?
✓ INTRAMEMBRANOUS
• first bone to form in the human body
✓ CLAVICLE
• very FIRST bone to form
• BOTH EC and IM
What is the most commonly fractured bone in human body?
✓ CLAVICLE
• very FIRST bone to form
• BOTH EC and IM
• MOST COMMONLY FRACTURED
First bones to develop???? I or E?
MOST BONES are formed by? I or E?
✓ INTRAMEMBRANOUS yung FIRST bones to develop but
✓ ENDOCHONDRAL yung most bones
What bones undergo endochondral ossification?
✓ SPHENOID
✓ PETROUS PART OF TEMPORAL BONE
✓ ETHMOID
✓ CONDYLE OF MANDIBLE
✓ OCCIPITAL BONE (BASILAR PART)
✓ LONG BONES OF LIMBS
✓ SHORT BONES OF LIMBS
It is a bat-shaped or butterfly shaped bone
✓ SPHENOID
• It is a bat-shaped or butterfly shaped bone
What is the hardest structure in head and neck?
✓ PETROUS part of temporal bone
What are the 2 parts of temporal bone ; Alin nasa inside and outside ; Alin yung via intramembranous and endochondral
✓ Squamous part - outside palpable ; INTRAMEMBRANOUS
✓ Petrous part - inside; yung pinakamatigas ; ENDOCHONRAL
Wallnut shaped bone?
✓ ETHMOID
• WALLNUT
Wjat part of mandible yung endochondral?
✓ CONDYLE
Wjat part of mandible yung endochondral?
✓ CONDYLE
2 parts of occipital bone? Alin intramembranous and endochondral?
✓ SQUAMOUS part - asa labas ; INTRAMEMBRANOUS
✓ BASILAR PART - inside ; ENDOCHONDRAL
Endochondral formations usually alin lumalabas boards
ENDOCHONDRAL
✓ Sphenoid
✓ Ethmoid
✓ Condyle
Most commonly fractured bone in human body?
Most commonly fracture facial bone?
✓ Clavicle - human body
✓ NASAL Bone - facial bone
Other term for nasal bone
Nasal bone in deficient in px with
✓ Nasal bone “Bridge of nose”
• most commonly fractured facial bone
DEFICIENT in patients with
✓ Down syndrome
✓ Achondroplasia / Achondroplastic dwarfism
Nose bleeding
Anong plexus yung nadadamage usually pag super init
Management if nose bleeding
✓ Epistaxis
• nose bleeding
✓ KIESSELBACH’S plexus
• “Little’s area” ; an ARTERY
✓ Cold compress for VC or yuko para magflow blood palabas
Strongest bone in head and neck?
Strongest bone in human body?
Smallest bone?
Strongest facial bone?
✓ PETROUS part of temporal bone
• head and neck
✓ FEMUR
• LONGEST and STRONGEST bone in human body kaya masakit pag sinipa
✓ STAPES
• smallest bone
✓ MANDIBLE
• strongest facial bone
Smallest muscle?
Smallest skeletal muscle?
✓ ARRECTOR pili muscle
• smallest muscle
• smooth muscle
✓ STAPEDIUS
• smallest skeletal muscle
Bone commonly fractured during CPR
Most commonly dislocated joint in children
Most commonly disclocated joint in adults
✓ Xiphoid process
• commonly fractured during cpr
✓ ELBOW JOINT
• CHILDREN
✓ SHOULDER JOINT
• ADULTS
Largest carpal bone
Head shape carpal bone
Boat shaped carpal bine
Most commonly fractured carpal bone
Largest tarsal bone
Boat shaped tarsal bone
Heel bone
Ankle bone
✓ CAPITATE
• LARGEST carpal bone
• HEAD - shape carpal bone
✓ SCAPHOID
• BOAT - shaped carpal bone
• most commonly FRACTURED carpal bone
✓ CALCANEUS / “HEEL BONE”
• LARGEST tarsal bone
✓ NAVICULAR
• BOAT - shaped tarsal bone
✓ CALCANEUS - heel bone
✓ TALUS - ankle bone
Superoposterior portion of nasal cavity contains?
What separates nasal cavity to left and right side
✓ OLFACTORY Receptors (CN I) sense of smell
• SUPEROPOSTERIOR portion of nasal cavity
✓ NASAL SEPTUM
• sep left and right side of NC
Nasal septum is made up of 3 structures
✓ Nasal septum
• separated right and left side of NC
Nasal septum is made up of :
✓ Vomer
✓ Perpendicular Plate Of Ethmoid
✓ Septal cartilage
• made up of HYALINE cartilage
Nasal septum is made up of 3 structures
✓ Nasal septum
• separated right and left side of NC
Nasal septum is made up of :
✓ Vomer
✓ Perpendicular Plate Of Ethmoid
✓ Septal cartilage
• made up of HYALINE cartilage