SLO

Student Learning Objectives for the Digestive System

• Describe the function of the digestive system:
  The digestive system is responsible for breaking down food into nutrients that the body can absorb and utilize. It includes the organs involved in the ingestion, processing, and assimilation of food.

• Differentiate the organs of the alimentary canal from accessory organs:

  • Alimentary Canal: The continuous tube from the mouth to the anus involved in digestion.

  • Accessory Organs: Organs that aid in digestion but are not part of the alimentary canal, including the liver, gallbladder, and pancreas.

• To understand the biliary tree and the vascular arrangement in the abdomen:

  • The biliary tree consists of the liver, gallbladder, and bile ducts that transport bile.

  • The vascular arrangement includes arteries and veins supplying blood to and from the digestive organs.

• Describe the microscopic anatomy of the tunics of the GI tract:
  The gastrointestinal (GI) tract consists of four tunics:

  • Mucosa: The innermost layer, lined with epithelium, involved in absorption and secretion.

  • Submucosa: A layer containing connective tissue, blood vessels, and nerves that support the mucosa.

  • Muscularis externa: Responsible for peristalsis and movement of food; made up of two layers of smooth muscle.

  • Serosa: The outermost layer, providing a protective covering.

• Describe the gross and microscopic anatomy of the esophagus, stomach, small and large intestine:

  • Esophagus: A muscular tube with stratified squamous epithelium.

  • Stomach: Contains rugae and gastric pits, has an oblique layer of smooth muscle, and is divided into cardiac, fundus, body, and pyloric regions.

  • Small Intestine: Characterized by circular folds, villi, and microvilli; consists of the duodenum, jejunum, and ileum.

  • Large Intestine: Features teniae coli, haustra, and epiploic appendages.

• Relate the anatomical modifications of the wall of the GI tract to the functions of the regions:
  Each segment of the GI tract has structural adaptations suited to its specific functions (e.g., absorption in the small intestine vs. waste storage in the large intestine).

• Describe the gross anatomy and functions of the liver, gallbladder, and pancreas:

  • Liver: Largest internal organ; processes nutrients from the intestines and produces bile.

  • Gallbladder: Stores and concentrates bile.

  • Pancreas: Produces digestive enzymes and hormones.

• To discern differences in the anatomy throughout the GI tract:
  Recognize variations in tissue structure and organization that correlate with varied functionality along the tract.

• Differentiate between intraperitoneal and retroperitoneal organs:

  • Intraperitoneal Organs: Organs fully surrounded by peritoneum (e.g., stomach, liver, ileum, jejunum).

  • Retroperitoneal Organs: Organs located behind the peritoneum (e.g., kidneys, pancreas, descending and ascending colon).

• Describe the basic processes of digestion and absorption:
  This involves mechanical and chemical digestion followed by nutrient absorption predominantly in the small intestine.

Alimentary Canal

• Components:

Oral cavity

Pharynx

Esophagus

Lower esophageal sphincter

Stomach

Cecum

Appendix

Ascending colon

Right colic (hepatic) flexure

Transverse colon

Left colic (splenic) flexure

Descending colon

Sigmoid colon

Rectum

Anal canal

Internal and external anal sphincters

Tunics of the GI-tract

• Mucosa

Muscularis mucosae

Submucosa

Submucosal plexus

Muscularis externa

Myenteric plexus

Serosa

Segments Distinctions

• Esophagus:

  • Lined with stratified squamous epithelium, non-keratinized

• Stomach:

  • Features rugae and gastric pits, with an oblique layer of smooth muscle

  • Divided into cardiac, fundus, body, and pyloric regions

  • Exhibits greater and lesser curvatures

• Small Intestine:

  • Includes circular folds, villi, and lacteals

  • Composed of duodenum, jejunum, and ileum

  • Contains Brunner's glands

• Large Intestine:

  • Characterized by teniae coli, haustra, and epiploic appendages

Accessory Organs

• Salivary Glands:

  • Parotid

  • Submandibular

  • Sublingual

• Liver:

• Gallbladder:

• Pancreas:

  • Acinar

  • Pancreatic duct

  • Hepatopancreatic ampulla / Ampulla of Vater

  • Hepatopancreatic sphincter / Sphincter of Oddi

  • Duodenal papilla

Miscellaneous

• Arteries:

  • Superior mesenteric artery

  • Inferior mesenteric artery

• Veins:

  • Hepatic portal vein

• Muscles and Peritoneum:

  • Levator Ani muscle

  • Peritoneum:

  • Parietal peritoneum

  • Visceral peritoneum

  • Mesentery

Retroperitoneal organs:

• Suprarenal glands

• Aorta and inferior vena cava (IVC)

• Duodenum (2nd and 3rd segments)

• Pancreas

• Ureters

• Colon (Ascending and Descending)

• Kidneys

• Esophagus

• Rectum

Intraperitoneal organs:

• Stomach

• Liver

• Ileum

• Jejunum

• Transverse Colon

• Sigmoidal Colon

Student Learning Objectives for Nervous Tissue

• Explain the structural and functional divisions of the nervous system:

  • Central Nervous System (CNS): Comprises the brain and spinal cord.

  • Peripheral Nervous System (PNS): Includes all neural tissue outside the CNS.

• List the six types of neuroglia in nervous tissue and distinguish by location and function:

  1. Astrocyte: Maintains blood-brain barrier and supports neurons.

  2. Microglia: Acts as immune defense in the CNS.

  3. Oligodendrocytes: Form myelin sheaths in CNS.

  4. Ependymal cells: Line ventricles and secrete cerebrospinal fluid (CSF).

  5. Satellite cells: Provide support and nutrients to PNS neurons.

  6. Schwann cells: Form myelin sheaths in PNS.

• Familiarize with the terminologies that describe the function of neurons:

  • Depolarization: The process in which the neuron becomes more positive compared to the resting membrane potential.

  • Action potentials / Nerve impulse: Brief electrical impulses that are the primary means of communication in the nervous system.

• Describe the structures of a typical nerve:

  • Myelinated axons: Axons surrounded by myelin sheaths that enable faster signal conduction.

  • Unmyelinated axons: Axons without myelin sheaths, conducting signals slower.

  • Endoneurium: Connective tissue surrounding individual axons.

  • Epineurium: Outer layer of connective tissue surrounding the entire nerve.

  • Perineurium: Layer of connective tissue surrounding each fascicle of axons.

• Classify neurons both structurally and by locale:

  • Multipolar neurons: Have multiple dendrites and a single axon, mainly found in the CNS.

  • Bipolar neurons: Have one axon and one dendrite, found in special sensory areas like the retina.

  • Unipolar neurons (pseudounipolar): Have a single process that branches into two parts, mainly found in sensory neurons of the PNS.

• Describe structural components of a neuron:

  • Dendrites: Receive signals and transmit them to the cell body.

  • Cell body: Contains the nucleus and organelles for cell function.

  • Nucleus: Contains genetic material.

  • Axon Hillock: Connects the axon to the cell body; initiates action potentials.

  • Axon / nerve fiber: Carries impulses away from the cell body.

  • Myelin sheath: Insulating layer around some axons, speeding up impulse transmission.

  • Myelin sheath gap (Node of Ranvier): Gaps in the myelin sheath where action potentials occur.

  • Axon terminal: Endings of the axon that release neurotransmitters into the synapse.

  • Synaptic vesicles: Store neurotransmitters for release during synaptic transmission.

  • Synaptic cleft: Gap between neurons at the synapse.

  • Synapse: Junction between two neurons.

Student Learning Objectives for the Central Nervous System (Brain)

• Describe the meningeal coverings surrounding the brain:
  The brain is protected by three layers of meninges:

  1. Dura mater: The tough outer layer consisting of the periosteal and meningeal layers.

  2. Arachnoid mater: The middle layer with a web-like structure.

  3. Pia mater: The delicate inner layer directly covering the brain.

• Explain how the meninges and cerebrospinal fluid protect CNS structures:
  The meninges and CSF cushion the brain and spinal cord against damaging forces and provide a stable environment.

• Name and describe the locations of the ventricles of the brain:

  • Lateral ventricles: The largest, located within each hemisphere.

  • Third ventricle: Located centrally between the hemispheres.

  • Fourth ventricle: Located at the base of the cerebellum.

  • Cerebral aqueduct: Connects the third and fourth ventricles.

• Name and describe the locations of the meningeal cranial dura folds:

  1. Falx cerebri: Separates the two cerebral hemispheres.

  2. Tentorium cerebelli: Separates the cerebrum from the cerebellum.

  3. Falx cerebelli: Separates the two cerebellar hemispheres.

• Describe the spaces formed by the meninges and the possible clinical correlations:

  • Subdural space: Potential space between dura and arachnoid mater that can accumulate blood or fluid.

  • Subarachnoid space: Contains CSF and blood vessels; critical for circulation and CNS function.

• Explain how cerebrospinal fluid (CSF) is formed:
  CSF is produced by choroid plexuses in the ventricles and circulates through the ventricular system and subarachnoid space.

• Identify the anatomical-functional correlations of conditions:

  • Parkinson's Disease: Affects motor control; associated with basal nuclei dysfunction.

  • Alzheimer's Disease: Related to neurodegeneration and memory loss.

  • Ataxia: Involves coordination issues, often tied to cerebellar dysfunction.

  • Broca's Aphasia: Difficulty in speech production due to damage in Broca’s area.

  • Wernicke's Aphasia: Language comprehension difficulties due to damage in Wernicke’s area.

  • Epidural Hematoma: Blood accumulation between skull and dura; urgent and can be life-threatening.

  • Subdural Hematoma: Blood accumulation under the dura; often from head trauma.

• Gross Anatomy of the Brain:

  • Longitudinal fissure: Separates the two cerebral hemispheres.

  • Frontal lobe: Involved in higher executive functions and motor control.

  • Primary motor cortex: Responsible for voluntary motor commands.

  • Prefrontal cortex: Involved in planning complex cognitive behavior.

  • Broca's area: Involved in language processing and speech production.

  • Central sulcus: Divides the frontal and parietal lobes.

  • Parietal lobe: Involved in sensory information processing.

  • Somatosensory cortex: Processes sensory inputs from the body.

  • Somatosensory association area: Processes and integrates sensory inputs.

  • Occipital lobe: Responsible for visual processing.

  • Visual cortex: Processes visual stimuli.

  • Visual association area: Interprets visual information.

  • Temporal lobe: Involved in auditory processing.

  • Auditory cortex: Processes auditory information.

  • Auditory association area: Interprets sounds.

  • Olfactory cortex: Processes smell information.

  • Wernicke's area: Involved in language comprehension.

  • Insula: Plays a role in emotions and homeostasis.

Brain Ventricles & Circulation:

• Third ventricle

• Cerebral aqueduct

• Fourth ventricle

• Lateral apertures and median aperture: Allow CSF to flow into the subarachnoid space.

• Central canal of the spinal cord: Contains CSF.

• Arachnoid granulations: Structures that aid in the absorption of CSF.

Distribution of Gray and White Matter:

• Gray matter: Primarily comprised of neuron cell bodies; located on the surface of the cerebrum.

• White matter: Composed of myelinated axons; forms the inner layer of the cerebrum.

Major Regions of the Adult Brain:

• Cerebrum: Largest brain region, responsible for higher cognitive functions.

• Diencephalon: Composed of thalamus (sensory relay) and hypothalamus (homeostasis).

• Cerebellum: Coordinates voluntary movements and balance.

• Brain Stem: Controls vital functions and relays signals between brain and spinal cord.

  • Midbrain: Processes visual and auditory information, controls reflexes.

  • Pons: Connects different parts of the brain; regulates sleep and respiration.

  • Medulla Oblongata: Controls autonomic functions, such as breathing and heart rate.

Functions of Key Structures:

• Gustatory cortex: Processes taste information.

• Corpus callosum: Connects left and right hemispheres facilitating communication.

• Basal nuclei: Involved in the control of voluntary motor movements.

• Caudate nucleus, Lentiform nucleus, Ventral striatum: Substructures of the basal ganglia involved in movement regulation.

• Limbic system: Critical for emotion, memory, and motivation.

  • Hippocampus: Essential for forming new memories.

  • Amygdala: Involved in emotional responses.

• Reticular formation: Regulates wakefulness and alertness.

• Reticular activating system: Involved in arousal and consciousness.

• Diencephalon components:

  • Pineal gland: Regulates circadian rhythms.

  • Thalamus: Relay station for sensory information.

  • Hypothalamus: Controls autonomic functions and regulates hormones.

  • Mammillary body: Associated with memory processing.

  • Corpora Quadrigemina: Involved in auditory and visual reflexes, containing superior and inferior colliculi.