1st semester quick review
TRANSCRIPT
1st Semester Quick Review
Jonathan AbesamisRoss University School of Medicine
August 11, 2010
Connective Tissue Sheaths of Peripheral Nerves
• Epineurium – Dense C.T.• Perineurium – Flattened Epithelium– Blood Nerve Barrier– No Basement Membrane
• Endoneurium – Reticular Fibers
Myelin
• Major Dense Line: Fused Inner Leaflet• Intraperiod Line: Fused Outer Leaflet
Multiple Sclerosis
• Episodes of random, multifocal inflammation, edema, and subsequent demyelination of axons in CNS.
• Each episode may become malignant.
Astrocytes
• Think “End Feet”• Scavenges Ions & Metabolic Remnants• Glial Fibrillar Acidic Protein (GFAP)– Unique to Astrocytes
Neuron / Nissel Bodies
• No Nissel Bodies in Axon• Transportation Along Axon:– Slow Protein, Actin– Intermediate Mitochondria– Fast Synaptic Vessicles
Gastroschisis
• Newborn Infant with an abdominal wall defect.
Neural Tube Defects
• Think “Failure to Close”• Cranial = Anencephaly• Cervical/Sacral = Spina Bifida
Ectopic Pregnancy
• Implantation outside uterus.– 90% are tubal pregnancies.– Eventually hemorrhage results.
• Implantation in abdominal cavity & ovary are rare.
Placenta Previa
• Implantation in lower segment of uterus.• Placenta covers opening.• Leads to severe bleeding.
Lymphocyte
• The only leukocyte that can re-enter the bloodstream after entering the connective tissue.
Cell Motility / Wound
• 1st on Site = Neutrophils• 2nd on Site = Fibroblasts
Integrins
• Actin Integrins ECM• Heterodimers of α and β subunits.• Different combinations of different α and β
recognize different ligands.
Lamellipodium
• Actin rearrangements inside the cell to move the cell body.
• Integrins to attach the cell to the substratum.
Epistasis
• Patient has a certain genotype but the expressed phenotype is partially controlled by another gene.– Patient could be AB, but also has hh gene for
Fructose Transferase Oh
Hemolytic Disease of the Newborn
• IgG will attack newborn.• 2nd Child or Later– At Birth of Rh+ Baby– At Abortion of Rh+ Fetus– By Transfusion– By Amniocentesis/Chorion Villi Sampling
Amylase
• Indicative of Acute Pancreatitis
γ-Glutamyltransferase (γ-GT)
• Indicative of Liver Disease
Aspartate Transaminase (AST)
• Indicative of Cardiac M.I.• Indicative of Liver Trouble
Alanine Transaminase (ALT)
• Indicative of Acute Viral Hepatitis• Indicative of Cirrhosis• Indicative of Cholestatic Jaundice
Lactate Dehydrogenase (LDH)
• LDH 1 & 2 = Acute M.I.• LDH 5 = Acute Hepatitis
Therapeutic Plasma Preparations
• Fresh Frozen Plasma = Liver Cirrhosis• Cryoprecipitate = Clotting Disorders• Factor VIII Concentrate = Hemophelia A• Albumin 5% = Hypovolemic Shock• Albumin 25% = Cerebral Edema• Immune Serum Globulin = Immune Deficiency
Tetanus
Electrophoresis: Nephrotic Syndrome
• Albumin ↑• α2 ↑↑• γ↓
Electrophoresis: Liver Cirrhosis
• Albumin ↑• α2 ↑• γ (IgA) ↑↑• Think “Over Production”
Electrophoresis: Immediate Response
• Albumin ↓• α2 ↑
Electrophoresis: Delayed Response
• Albumin ↓• α2 ↑• γ ↑
Blood in Urine
• Haptoglobin & Hemopexin– Prevent loss of hemoglobin & heme groups.
• Low Plasma Haptoglobin (Hemoglobinuria)• Normal Plasma Haptoglobin
Acute Phase Proteins
• Synthesized in Bulk in Response to Infection• α1-Antiprotease = Cells Are Dying
• α2-Antiprotease = Death of Hepatocytes
• β2-Microglobin = Renal Disease• Ceruloplasm = Wilson’s Disease
Hyperalbuminemia
• Dehydration• Excessive Stasis During Venepuncture– (a.k.a. “Fake Condition”
Hypoalbuminemia
• Think “vasodilation”• Albumin↓• α2↑• Proteins in Urine• Burns, Renal Disease, G.I. Loss, Hemorrhage
Plasma Protein Production
• With the exception of immunoglobulins (B-lymphocytes) all plasma proteins are synthesized in the liver.
Serum vs. Plasma
• Plasma contains Fibrinogen– Allowed to Coagulate
Pyruvate Kinase Deficiency
• Hemolytic Anemia– Enlarged Spleen– Abnormal RBS Shape– 2,3-BPG ↑– ATP ↓
Wrist: Radiocarpal Joint
• Radius– *No Ulna
• Carpals– Scaphoid (RE: Pollex)– Lunate– Triquetrum– *No Pisiform
Posterior Dislocation of Elbow
• May tear Ulnar Collateral Ligament– Anterior (Think “diagonal”)– Posterior– Oblique
• May damage Ulnar Nerve
Glenoid Labrum
• Fibrocartilage• Inferior Aspect of Shoulder Cuff
Acromioclavicular Joint
• Acromioclavicular• Coracoacromial• Coracoclavicular Ligament– Trapezoid– Conoid
Joints of the Hand
• Thumb = Saddle– Trapezium
• Metacarpal Phalangeal = Condyloid• Palm = Planar• Fingers = Hinge
Sternoclavicular Joint
• Interclavicular• Anterior Sternoclavicular• Costoclavicular
Cartilagenous Joints
• Hyaline = Neck of Femur• Fibrocartilage = Intervertebral Discs
Hilton’s Law
• Nerves that supply a joint also supply the muscles moving that joint and the skin overlying their distal attachments.
Clara Cells
• Only in Bronchioles• 3 Functions– CCSP (Surfactant) & GAGs (Reduce Adhesion)• Decrease Inflammatory Response
– Cytochrome P450– Differentiate into Epithelial Tissue
Thymoma
• Can compress the Right Cephalic Vein
Bronichal Veins
• Venous Drainage of Lungs– Bronical Veins• Azygous Vein
– Superior Vena Cava
• Accesory Hemiazygous/Left Superior Intercostal Vein
– Pulmonary Veins
Bronichial Arteries
• Blood Supply for Lungs– Root of Lung– Supporting Tissues– Visceral Pleura
Thoracocenthesis
• Remove fluid/pus/blood• Location:– 9th Intercostal Space– Superior to Rib• Think “VAN”
– Midaxillary Line
Lymph Drainage of Thorax
• Superior to Clavical– Inferior jugular Lymph Nodes
• Inferior to Clavical– Axillary Lymph Nodes
Layers of Thorax
• Skin• Superficial Fascia– External Intercostal Muscles– Internal Intercostal Muscles– Innermost Intercostal Muscles
• Endothoracic Fascia• Parietal Pleura
Embryology: Umbilical Veins
• Left: Persists; Brings 02 From Mother• Right: Obliterated 2nd Month of Development
Embryology: Vitelline Veins
• Left: Regresses• Right: Forms Hepatic Portion of IVC
Embryology: 6 Aortic Arches
• 1st: Maxillary• 2nd: Stapedial• 3rd: Common/Internal Right & Left Carotid• 4th: Aortic Arch & Right Subclavian• 6th: Pulmonary Arteries– Ductus Arteriosus
• Think “Head, Head, Neck, Heart, Lungs”
Fragile X Syndrome
• Female: Premutation, 20% Risk for Premature Ovarian Failure
• Male: Premutation, Unmethylated Risk for FXTAS
X-linked Diseases
• Fragile X• Hemophelia• Duchenne Muscular Dystrophy– Becker’s Muscular Dystrophy (15%)
• Hypophosphatemia– Think “PHEX”
DMD Testing
• CK Levels• Stain for Dystrophin Protein• PCR & Linkage Analysis
Osteogenesis Imperfecta
• Glycine Substitution– Collagen Packs Tightly
• C Terminus worse than N Terminus• In Type I: α1 worse than α2
– More α1 expressed
Embryology: Ductus Arteriosus
• Ductus Arteriosus Ligamentum Arteriosum– Think “Left Recurrent Laryngeal N.”
Ankylosing Spondylitis
• Chronic Inflammatory Disease– Axial Skeleton
• Presents as Back Pain• Treatment: Supportive/Preventative
Tetrology of Fallot
• VSD• Overriding Aorta• Pulmonary Stenosis• Hypertrophy of RV
Hypophosphatemia
• X-linked– ↓PHEX = ↑PTN ↓NPT2 = ↓Phosphate
• Autosomal Dominant– ↑FGF3 ↓NPT2 = ↓Phosphate
• Autosomal Recessive– ↓NPT2 = ↓Phosphate
Hamartomas
• Altering Tumor Supressors• No stimulation; only lack of inhibitor.• TSC1 vs. TSC2– TSC2 is more common.– Think “HemarTWOmas”
Polycystic Kidney Disease
• Kidney Failure• PKD1 vs. PKD2– PKD1 is more common.
Autosomal Recessive Diseases
• Hereditary Hemachromatosis• EDS VI & VII• Hypophosphatemia (Think “NPT2”)• Recessive Dystrophic EB– Carcinomas
Lung Branching
• 23 Branch Generations– 1-16: Anatomical Dead Space– 17-23: Respiratory Zone
Familial Hypertrophic Cardiomyopathy
• MYH7 = β Myosin Heavy Chain• TNNT2 = cTnT• ??? = Myosin Binding Protein
Partitioning of Outflow Tract
• Aortico Pulmonary Septum– Divides;
• Truncus Arteriosus & Conus Cordis– Into;
• Aorta & Pulmonary Trunk
Differentiation of Heart Tube
• Think “ABC”– Truncus Arteriosus– Bulbus Cordis• Conus Cordis
– Primitive Ventricle– Primitive Atrium– Sinus Venosus
Primitive Inflow to Heart
• Vitteline Veins– Deoxy from Yolk Sac
• Cardinal Veins– Deoxy from Fetus
• Umbilical Veins– Oxy from Placenta• (a.k.a. “mom”)
5 Nerves of Skin
• Free Nerve Endings (Epidermis)– Pain
• Merkel (Stratum Basale)– Touch
• Meissner’s (Dermal Papilae)– Touch
• Pacinian – Pressure
• Ruffini’s– Strech
Effect of NO in Smooth Muscle
• NO Relax Increase Blood Flow• Arterioles & Metarterioles
Marfan Syndrome / Endocarditis
• Effects Fibrous Skeleton– Causes;
• Mitral/Aortic Valve Prolapse– Which leads to;
• Regurgitation
Valve Heart Sounds
• Think “All Physicians Take Money”
Internal Right Atrium
• Sinus Venarum– Smooth
• Crista Terminalis– Ridge Inbetween
• Pectinate Muscles– Rough
Typical Intercostal Nerves
• 3rd – 6th
• Endothoracic Fascia– Near the Angle of the Rib;
• Between Internal/Innermost Muscles– At the Angle of the Rib;
• Collateral Branches
Thoracic Splanchnic Nerves
• Supply Viscera Inferior to Diaphragm• Greater = T5-T9– Think “Heart”
• Lesser = T10-T11• Least = T12
5 Layers of Skin
• Stratum Corneum• Stratum Lucidum– Only in Thick Skin
• Stratum Granulosum– Water Proof– Contains Lamellar Granules
• Stratum Spinosum– Last Layer with Mitotic Activity
• Stratum Basale
Selectins in Diapedesis
• Endothelial Cells– P-selectins– E-selectins
• Lymphocytes– L-selectins
Blood Flow Control
• Arterioles– Smooth Muscle
• Capillaries– Pericytes
Fenestrated Capillaries
• Rapid Exchange• Kidney, Intestine, and Endocrine Glands– No Diaphragm in Renal Glomerulus
Metarterioles
• Discontinuous Smooth Muscle• If any smooth muscle Metarteriole; not
capillary
Asthma
• Constriction of Bronchioles– Dyspnea
• β2 Agonist Relax
BALT
• Bronchus Associated Lymphoid Tissue• Protects Against Infection
Steps of Smell
• Odorant & Receptors• Mitral Cells/Glomeruli– If Enough;
• Signal Sent
Olfactory Epithelium
• Pseudostratified Columnar Epithelium• Olfactory Receptor Cells• Sustentacular Cells– Supporting Cells
• Basal Cells
Brody Jenner Syndrome
• Cilia & Flagella Affected– Males Infertile
• Lack of Dynein
Respiratory Epithelium
• Ciliated Columnar• Goblet Cells• Brush Cells– Sensory Receptors
• Basal Cells• Granular Cells– Secrete Bombasin & Seratonin
Nasal Cavity
• Vestibule– Stratified Squamous / Vibrissae
• Respiratory Segment• Olfactory Segment
Sympathetic Trunk
• Inside of the Mediastinum• Outside of the Pleural Cavity
Lung Volume / Respiratory Disease
• Obstructive– Emphysema, Chronic Bronchitis– ↓TLC, ↑↑RV, ↑RV/TLC%
• Restrictive– Pulmonary Fibrosis– ↓TLC, ↓RV, (normal) RV/TLC%
Right Vagus Nerve
• Right Vagus Nerve– Anterior to Subclavian Artery;
• Right Recurrent Laryngeal Nerve– Posterior to Hilum
• Right Pulmonary Plexus & Esophageal Plexus• *Left Vagus passes over arch of aorta.
Muscle Fascia
• Epimysium– Entire Muscle
• Perimysium– Bundle
• Endomysium• Myofibril– Individual Fiber
Classification of Skeletal Muscle
• Red: Type I– Slow Repetitive– Posture
• White: Type IIB– Fast Twitch– Fingers & Eyes
• Intermediate: Type IIA
Hind Brain
• Voluntary Movement– Cerebellum• Initiate
– Pons• Regulate
– Medulla– 4th Ventricle
Nerve Regeneration
• Repaired by proliferation of astrocytes.• Astrocytic Scar = Gliosis– Anterograde Degeneration– Only PNS– Only if soma is intact.
Layers of Cerebral Cortex
• Molecular Layer• Purkinje Layer• Granular Cell Layer
Blood Brain Barrier
• Endothelial Cells and Tight Junctions• Pass Freely: O2, H2O, CO2
• Active Transport: Glucose, aa, vitamins• Cannot Pass: Macromolecules
SNPs
• Single Nucleotide Polymorphism– Used to create haplotypes to differentiate
between maternal/paternal chromosomes.
Purines / Pyrimidines
• Think “GATTACA”• Purines– Guanine– Adenine
• Pyrimidines– Thymine– Cytocine
Camptothecin
• Chemotherapeutic Agent• Topoisomerase I Inhibitor• Used to Treat Cancer
Ciprofloxacin
• Antibiotic• Inhibits Gyrase Activity in Bacteria– Think “Topoisomerase II”
Doxorubicin / Etoposide
• Chemotherapeutic Agent• Inhibits Topoisomerase Type II• Used to Treat Cancer
Topoisomerase II / Gyrase
• 2 Cuts• Induces Negative Supercoils– Opening DNA instills positive supercoils.
Exonuclease vs. Endonuclease
• Exonuclease– Removes nucleotides from a 3’ end of DNA strand.– Think “Proofread”
• Endonuclease– Cut inside of a DNA strand to produce single
stranded nicks.• These nicked ends can be used by Exonucleases
Replication
• Eukaryotes replicate their DNA only in S-phase– Think “G1, S, G2, M”
Bacteria vs. Eukaryotes
• SSB / RPA• Primase / Pol α• Pol III Polymerase / Pol δ and ε• β2 Sliding Clamp (subunit of Pol III) / PCNA• 3’ Exonuclease of Pol I / RNaseH and/or FEN1• γ subunit of Pol III / RFC
Oligomycin
• Inhibition of ATP Synthase
Km
• The concentration of substrate at which ½ of the active sites are filled.
Inhibitors
• Competitive Inhibitors• Noncompetitive Inhibitors• Irreversible Inhibition– Covalent Bond– Most are toxins
Werner’s Syndrome
• Advanced Aging• Telomeres Shorter Than Normal
RNA vs. DNA Synthesis
• NTPs Instead of dNTPs• No Primers• No Proofreading• U instead of T• RNA pol
Rifampicin
• Inhibits RNA polymerase in bacterial cells by binding to β-subunit of RNA polymerase (the essential polymerase enzyme).
• Used to treat TB, Leprosy, MRSA, and bacterial meningitis due to lipophic nature and uniqueness.
• Adverse effects include hepatotoxicity.
Promoters
• Prokaryotic– TATAAT -10 bp
• Eukaryotic– TATA Box -25 bp– CAT Box -50 to -100
Ribosome Structure
• Prokaryotes (70S)– 50S (23S & 5S)– 30S
• Eurakyotes (80S)– 60S (28S, 5.8S, & 5S)– 40S