Podcast
Questions and Answers
Which statement correctly describes the function of the Nucleus Propulsus within the intervertebral disc?
Which statement correctly describes the function of the Nucleus Propulsus within the intervertebral disc?
- It provides blood supply to the vertebral column.
- It connects the vertebrae directly to the spinal cord.
- It anchors the spinal nerves to the vertebral bodies.
- It serves as a shock absorber and allows limited movement. (correct)
What is the primary purpose of the annulus fibrosus in the intervertebral disc?
What is the primary purpose of the annulus fibrosus in the intervertebral disc?
- To facilitate the movement of spinal nerves.
- To distribute weight evenly across the vertebral bodies.
- To provide a protective fibrous ring around the Nucleus Propulsus. (correct)
- To connect adjacent vertebrae directly.
Which curvature of the vertebral column is characterized by an outward curvature?
Which curvature of the vertebral column is characterized by an outward curvature?
- Lumbar Lordosis
- Sacral Lordosis
- Thoracic Kyphosis (correct)
- Cervical Lordosis
How do the radicular veins communicate within the spinal venous system?
How do the radicular veins communicate within the spinal venous system?
Which part of the vertebrae is mainly responsible for supporting body weight?
Which part of the vertebrae is mainly responsible for supporting body weight?
What is the primary function of autonomic fibers in peripheral nerves?
What is the primary function of autonomic fibers in peripheral nerves?
Which characteristic best describes a fascicle in the context of peripheral nerves?
Which characteristic best describes a fascicle in the context of peripheral nerves?
What role does the myelin sheath play in the function of axons?
What role does the myelin sheath play in the function of axons?
Which of the following correctly identifies the structure that wraps individual nerve fibers?
Which of the following correctly identifies the structure that wraps individual nerve fibers?
What is the main source of blood supply to peripheral nerves?
What is the main source of blood supply to peripheral nerves?
What is the primary role of the epineurium in spinal nerve anatomy?
What is the primary role of the epineurium in spinal nerve anatomy?
Which statement correctly describes a feature of the dorsal nerve root?
Which statement correctly describes a feature of the dorsal nerve root?
What distinguishes the ventral ramus from the dorsal ramus in spinal nerve functionality?
What distinguishes the ventral ramus from the dorsal ramus in spinal nerve functionality?
Which structure of the somite gives rise to skeletal muscles and the dermis of skin during embryonic development?
Which structure of the somite gives rise to skeletal muscles and the dermis of skin during embryonic development?
In the context of spinal nerve anatomy, what does the term 'mixed nerves' refer to?
In the context of spinal nerve anatomy, what does the term 'mixed nerves' refer to?
What is the primary function of the anterior funiculus in the spinal cord?
What is the primary function of the anterior funiculus in the spinal cord?
Which artery is primarily affected by blockage leading to anterior spinal artery syndrome?
Which artery is primarily affected by blockage leading to anterior spinal artery syndrome?
Where is white matter primarily located in the spinal cord?
Where is white matter primarily located in the spinal cord?
Which artery supplies approximately two-thirds of the cross-sectional area of the spinal cord?
Which artery supplies approximately two-thirds of the cross-sectional area of the spinal cord?
Which funiculus carries pain sensations to the brain?
Which funiculus carries pain sensations to the brain?
Flashcards
Neuron
Neuron
Functional units of the nervous system, composed of axons, dendrites, and the cell body (soma). They transmit electrical signals throughout the body.
Motor Fibers
Motor Fibers
Nerves that carry signals from the spinal cord or brain to muscles, causing them to contract.
Sensory Fibers
Sensory Fibers
Nerves that transmit sensory information from sensory organs to the central nervous system (CNS).
Autonomic Fibers
Autonomic Fibers
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Myelin Sheath
Myelin Sheath
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Perineurium
Perineurium
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Epineurium
Epineurium
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Mixed Nerves
Mixed Nerves
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Dermatome
Dermatome
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Somites
Somites
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Annulus Fibrosus
Annulus Fibrosus
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Nucleus Pulposus
Nucleus Pulposus
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Motion Segment
Motion Segment
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Spinous Process
Spinous Process
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Vertebral Body
Vertebral Body
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What is white matter in the spinal cord?
What is white matter in the spinal cord?
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What is the anterior funiculus?
What is the anterior funiculus?
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What is the lateral funiculus?
What is the lateral funiculus?
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What is the posterior funiculus?
What is the posterior funiculus?
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What is the anterior spinal artery?
What is the anterior spinal artery?
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Study Notes
Skeletal Joints
- Arthrology is the study of joints, including their anatomy, function, and treatment
- A joint is where bones meet; more mobility = less stability
- Structural classification of joints (based on binding):
- Fibrous (immovable): bones connected by dense fibrous connective tissue (e.g., sutures of the skull, gomphoses of teeth)
- Cartilaginous (slightly movable): bones connected by cartilage (e.g., synchondroses, symphyses like the pubic symphysis)
- Synovial (freely movable): most common type, enclosed in a capsule with synovial fluid (e.g., shoulder, hip, elbow)
- Functional classification of joints (based on movement):
- Synarthroses (immovable): fibrous joints
- Amphiarthroses (slightly movable): cartilaginous joints
- Diarthroses (freely movable): all synovial joints
Types of Synovial Joints (based on axes)
- Uniaxial (one plane): pivot, hinge, plane joints
- Biaxial (two planes): condyloid and saddle joints
- Multiaxial (three planes): ball and socket joints
Cartilaginous Joint Tissues
- Hyaline cartilage: found in articulating surfaces of long bones (e.g., trachea)
- Fibrocartilage is a combination of hyaline cartilage and dense connective tissue found in structures like intervertebral discs, pubic symphysis, and meniscus
Joint Cavity
- Synovial membrane: thin layer of tissue lining joints, bursae, and tendon sheaths; produces synovial fluid, lubricates joints
- Fibrous articular capsule: made of dense irregular C.T.; maintains joint stability
Intra articular Tissues
- Tissues within a joint, including ligaments, fibrocartilages, fat pads, and synovium (e.g., menisci in the knee)
- Meniscus is fibrocartilaginous structure that cushions the knee joint (medial and lateral)
Basic Joint Mechanics
- Osteokinematics: gross movements of bones at joints (e.g., flexion, extension)
- Arthrokinematics: motions of joint surfaces (roll, spin, glide)
Spinal Nerves
- Functional units of nervous system (axons, dendrites, soma)
- Motor fibers (efferent): transmit impulses from spinal cord/brain to muscles
- Sensory fibers (afferent): transmit sensory info to the CNS
- Autonomic fibers: innervate smooth muscle, cardiac muscle, and glands
- Cranial nerves (12): paired nerves directly from brain; motor, sensory, or both
- Axons: carry impulses away from the cell body, often within a myelin sheath
- Fascicles: bundles of nerve fibers
Spinal Nerve Anatomy
- Spinal nerves (31 pairs) are mixed (both sensory and motor)
- Anterior (ventral) rootlets of spinal nerves carry motor information from the spinal cord to muscles and glands
- Posterior (dorsal) rootlets carry sensory information from the body to the spinal cord
- Dorsal (posterior) rami innervate the back
- Ventral (anterior) rami innervate the rest of the body and form peripheral nerves
Peripheral and Spinal Nerve Organization
- Neuroglia supports the neurons and provides structure/physical support
- Endoneurium, perineurium, and epineurium
- Perineurium surrounds a fascicle (a bundle of nerves)
- Epineurium surrounds the entire nerve bundle
Spinal Cord Anatomy
- Protective coverings: dura mater, arachnoid mater, pia mater
- Subdural space; epidural space; subarachnoid space
- Denticulate ligaments attach spinal cord to dura mater; hold cord in place
- Conus medullaris is distal end, cauda equina is collection of spinal nerve roots
- Spinal cord has gray (cell bodies) and white matter (tracts)
Spinal Cord Vasculature/spinal arteries
- Anterior spinal artery supplies major portion of anterior spinal cord.
- Posterior spinal arteries supply posterior spinal cord.
- Segmental medullary arteries supply blood to the spinal cord at various levels
- Vessels supplying spinal nerves; roots
Vertebral Column (Bony Anatomy)
- Curvatures of the vertebral column vary through the spine (cervical lordosis, thoracic kyphosis, lumbar lordosis)
- Body, vertebral foramen, transverse processes, spinous processes, articular processes
- Intervertebral discs (annulus fibrosus, nucleus pulposus)
- Intervertebral discs act as shock absorbers
- Vertebral column supports the body.
Pelvis
- Ilium, Ischium, Pubis
- Articulate to form hip joint, and other pelvic-related structures
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