Bones Flashcards
How many bones does a baby have?
300
Skeletal System
consists of around 206 bones in an adult, along with cartilage, joints, and ligaments.
What percentage of the total body mass does the skeletal system account for
20% percent of the body mass. However it can vary depending on factors such as age, sex, and overall body composition
2 sections of the human skeleton
Axial and Appendicular Bones
Axial Bones
Includes skull and torso (vertebral column, and thoracic cage)
Appendicular Bones
Limbs
How many bones are present in skull
22 bones
Differentiate Cranial Bones and Facial Bones
Cranial bones: protect the brain
Facial bones: give structure to the face
What types of bones does the skull mainly consist of?
Flat bones
Fibrous joints that connect the bones of the skull
Sutures
Cranium consists of:
a vault (calvaria) and a base (top-down view)
Three fossae of the base (cranium) that produce the cranial cavity
Anterior Cranial Fossa
Middle Cranial Fossa
Posterior Cranial Fossa
House of the brain
Cranial cavity
3 other cavities in the skull
Orbit, Ear, and Nasal Cavity
8 Cranial Bones
Frontal
2 Parietal
2 Temporal
Occipital
Sphenoid
Ethmoid
What are the sutures in brain?
Coronal
Sagittal
Lambdoid
Squamous
Occipitomastoid
Connects Frontal and Parietal
Coronal Suture
Connects the 2 Parietal
Sagittal Suture
Connects Temporal and Occipital
Lambdoid Suture
Suture between the occipital bone and the mastoid portion of the temporal bone
Occipitomastoid Suture
Paired bilateral cranial suture that connects the temporal and parietal bones
Squamous Suture
Holes that nerves, arteries, and veins pass through
Foramina
Foramen magnum
hole for the spinal cord in the skull that allows the spinal cord to pass through and connect with the brainstem
14 facial bones
2 Nasal
2 Lacrimal
2 Inferior Nasal Concha
2 Palatine
2 Maxillary
2 Zygomatic
Mandible
Vomer
A bone that sits below the mandible and is not connected to any other bone
Hyoid
Other term for Vertebral column
Spinal column, spine
Vertebral column
Bones in the spine that forms S shape to support everything from the skull to the pelvis
How many bones are there in spine?
26 irregular bones.
5 Sections of the Spine and the bones
7 Cervical Vertebrae (C1-C7)
12 Thoracic Vertebrae (T1-T12)
5 Lumbar Vertebrae (L1-L5)
1 Sacrum (5 fused vertebrae)
1 Coccyx (Tailbone)
Major Ligaments in spine
Anterior longitudinal ligament
Posterior longitudinal ligament
Intervertebral Disc
Cushiony pads between vertebrae, made of nucleus pulposus and anulus fibrosus. Acting as shock absorbers
Intervertebral Discs
A small opening in each of the bones that make up your spine for spinal cord passage
Vertebral Foramen
Protrusion on vertebrae for muscle attachment
Spinous Process
Extend laterally from vertebrae for muscle attachment
Transverse Process
Individual Vertebra consists of
body and vertebral arch
Vertebral Arch is made up of
2 Lamina and 2 Pedicle
First seven vertebrae in the neck region
Cervical Vertebrae
Middle twelve vertebrae connected to ribs
Thoracic Vertebrae
Lower five vertebrae supporting more weight
Lumbar Vertebrae
Fused vertebrae below lumbar region
Sacrum
Tailbone made of fused tiny vertebrae
Coccyx
Comprised of sternum, ribs, and costal cartilage
Thoracic Cage
A flat bone right in the middle of thorax
Sternum
3 bones of sternum
Manubrium, Body, Xiphoid Process
How many pairs of ribs are there?
12
True ribs
1-7. Attach directly to the sternum via costal cartilage
False ribs
8-10 = Attach indirectly to the sternum via costal cartilage to cartilage from ribs above
11-12 = floating ribs
true ribs gets _______ going from 1 to 7, and false ribs going ______ from 8-12
longer, shorter
Pectoral girdle is
bones that attaches the upper limbs to the axial bones
Pectoral Girdle comprised of
Clavicle
Scapula
Collarbone with sternal end (connects to manubrium) and acromial ends (connects to scapula)
Clavicle
Thin, flat bone with superior, medial, and lateral borders
Scapula
Upper limb
Arm, forearm, hand
Long bone in the arm with specific parts like trochlea and capitulum
Humerus
Forearm consists of?
Radius and Ulna
Bone in the forearm with radial tuberosity and styloid process
Radius
Bone in the forearm longer than radius, with olecranon and coronoid process
Ulna
Connects Radius and Ulna
Interosseous membrane
Wrist made of eight short carpals
Carpus
Eight short carpals
Scaphoid
Lunate
Triquetrum
Pisiform
Trapezium
Trapezoid
Capitate
Hamate
Metacarpals
(thumb to pinky)
I
II
III
IV
V
Phalanges
Finger bones, 14 per hand, with distal, middle, proximal phalanges. Thumb has only two; no middle p.
Pelvic Girdle
attaches lower limbs to the axial skeleton
Hip Bones
Ilium, ischium, and pubis, fused from three separate bones at birth
Thigh bone, largest in the body, with parts like greater trochanter and patella
Femur
Leg consist of
Fibula and Tibia
Tibia
Thicker bone in the leg with features like medial malleolus and tibial tuberosity
Fibula
Thinner bone in the leg with head and lateral malleolus
Foot are comprised of
Tarsus, Metatarsals
Tarsal bones
Talus, Calcaneus, Cuboid, Navicular, Medial Cuneiform, Intermediate Cuneiform, Lateral Cuneiform
Metatarsals
I
II
III
IV
V
Phalanges (toes)
14 per foot, 3 per toes with distal, middle, proximal phalanges. Thumb has only two; no middle p.