Comprehensive Guide to Human Anatomy

May 5, 2025

Palpation, Percussion, and Auscultation

  • Palpation: Feeling with firm pressure.
  • Percussion: Sharply tapping specific body sites to detect vibrations.
  • Auscultation: Listening to organ sounds.

Upper and Lower Limb Anatomy

Upper Limb

  • Shoulder
  • Axilla
  • Arm
    • Elbow to shoulder
  • Forearm
    • Elbow to wrist
  • Hand

Lower Limb

  • Gluteal
  • Thigh
    • Knee to hip
  • Leg
    • Knee to ankle
  • Foot

Anatomical Terms

  • Arm = Brachium
  • Forearm = Antebrachium
  • Axilla = Armpit
  • Manus = Hand
  • Pes = Foot
  • Crural = Leg

Movement Terminology

  • Circumduction: Think circle.
  • Rotation: Think dot.
  • Protraction: Moving a body part anteriorly.
  • Retraction: Moving a body part posteriorly.
  • Flexion of Thumb: Coronal/frontal.
  • Abduction/Adduction: Sagittal plane.
  • Superficial: Close to surface.
  • Deep: Deeper in body.

Fascia and Skin

  • Fascia
    • Superficial: Loose, fatty
    • Deep: Thin, fibrous, no fat
  • Cutaneous: Anything associated with skin

Anatomical Sides and Structures

  • Ipsilateral: On the same side (e.g., gallbladder and right lung)
  • Contralateral: On the opposite side (e.g., gallbladder and spleen)
  • Unilateral: Only on one side (e.g., spleen or appendix)
  • Bilateral: On both sides (e.g., lungs or ovaries)
  • Process: Bone protrusion for muscle attachment or where bones meet
  • Facet: Where bone meets another bone
  • Foramen: Hole
  • Fossa: Bone depression
  • Tubercle: Muscle attachment site

Specific Anatomical Points

  • Inferior angle of scapula: Around T7
  • Iliac crest: Around L4
  • Triangle of Auscultation: Gap in muscle above the scapula
  • Pectoral Girdle: Clavicle and scapula
    • Attachment for appendicular skeleton
  • Pelvic Girdle: Os Coxae
    • Attachment for appendicular skeleton

Vertebral Column

  • Cervical: Neck
  • Thoracic: Trunk
  • Lumbar: Lower back

Abnormal Curvatures

  • Scoliosis: Lateral deviation of vertebrae
  • Kyphosis: Posterior curvature in thoracic region
  • Lordosis: Increased lumbar curvature

Vertebral Structures

  • Intervertebral foramen: Exit for spinal nerves
  • Bifid Spinous Process: Split in cervical vertebrae
  • Transverse Foramen: In cervical vertebrae

Muscles Overview

Superficial Back Muscles

  • Connect upper limb to trunk, stabilize pectoral girdle
  • Originate on the scapula:
    • Deltoid
    • Teres Major/Minor
    • Infraspinatus
    • Supraspinatus
    • Subscapularis
  • Insert on humerus

Rotator Cuff Muscles

  • Supraspinatus, Infraspinatus, Teres minor, Subscapularis

Serratus Muscles

  • Serratus Anterior: Protracts scapula
  • Serratus Posterior Inferior: Depresses ribs
  • Serratus Posterior Superior: Elevates ribs

Nerve and Muscle Function

  • Muscles at an angle often involved in rotation.
  • Rotatores: Vertebrae to vertebrae
  • Levator Costarum: Rib to vertebrae
  • Intertransversarii: Lateral rotation
  • Interspinales: Back extension

Bandage Muscles

  • Splenius Capitis
    • Origin: Ligamentum nuchae
    • Insertion: Skull/cervical vertebrae
  • Splenius Cervicis

Suboccipital Region

  • Responsible for head nodding "yes" and "no"
  • Atlanto-Occipital Joint: Between C1 and Head

Gluteal Muscles

  • Laterally rotate thigh; Gluteus medius/minimus medially rotate & abduct thigh

Spinal Cord

  • Ends around L1-L2
  • Larger in cervical/lumbar regions (nerve innervation)
  • Filum Terminale: Continuation of pia mater, not a nerve

Spinal Nerves

  • Carry sensory and motor information

Proprioception

  • Body's non-visual awareness of surroundings

Vertebral and Nerve Counts

  • Cervical Vertebrae: 7; Nerves: 8
  • Thoracic Vertebrae: 12; Nerves: 12
  • Lumbar Vertebrae: 5; Nerves: 5
  • Sacral Vertebrae: 5 (fused); Nerves: 5
  • Co1
  • Total: 31 nerve pairs

Meninges and Cerebrospinal Fluid

  • Covers brain/spinal cord
  • Meningitis: Inflammation of meninges
  • Cerebrospinal Fluid (CSF): Shock absorber, diffusion medium
  • Pia Mater: Vascular
  • Denticulate Ligaments: Pia mater extensions

Reflexes

  • Spinal Reflex Arc: Sensory impulses path
  • Monosynaptic: Direct synapse with motor neuron
  • Polysynaptic: Interneurons present
  • Stretch Reflex: Monosynaptic (e.g., knee jerk)

Dermatomes and Spinal Tap

  • Dermatomes: Sensory regions by single spinal nerve
  • Spinal Tap: CSF examination, epidural anesthesia

Tissue Types

  1. Epithelial: Layered cells; covers organs, forms glands
    • Functions: Protection, secretion, absorption
  2. Connective: Less cells, more extracellular material
    • Functions: Support, protect, bind organs
  3. Muscle: Contractile cells
    • Types: Skeletal, cardiac, smooth

Muscle Shapes

  • Parallel: Fibers parallel (e.g., Rectus abdominis)
  • Circular: Concentric fiber arrangements (e.g., Orbicularis oculi)
  • Convergent: Broad area fibers (e.g., Pectoralis major)
  • Pennate: Short fibers, tendon along muscle
    • Unipennate: Palmar interosseous
    • Bipennate: Rectus femoris
    • Multipennate: Deltoid

Blood Vessels

  • Tunica Externa: Outermost, anchors vessel
  • Tunica Media: Smooth muscle, regulates diameter
  • Tunica Intima: Innermost, elastic fibers

Joint Types

  • Gliding: Carpal/tarsal bones
  • Hinge: Knee, elbow
  • Condyloid: Biaxial (e.g., MCP joint)
  • Saddle: Biaxial (e.g., carpometacarpal)
  • Ball and Socket: Multiaxial
  • Pivot: Rotation (e.g., elbow)
  • Mobility vs. Stability: More mobile = less stable

Forearm and Hand Muscles

  • Extensor Muscles: Posterior forearm, radial nerve
  • Flexor Muscles: Anterior forearm
  • Extensor Compartment: Various muscles for wrist/digit extension
  • Anatomical Snuffbox: Tendons of abductor and extensor pollicis

Leg Muscles

  • Lateral Leg
    • Superficial Posterior: Gastrocnemius, Soleus, Plantaris
    • Lateral: Fibularis longus/brevis
  • Anterior Compartment: Tibialis anterior, Extensor digitorum longus, Extensor hallucis longus

Pectoral Region

  • Axilla: Triangular area, arm-thorax junction
  • Muscles moving humerus/shoulder originate from clavicle, sternum

Flexors of the Leg

  • Gracilis, Sartorius, Gastrocnemius

Hand and Foot Structures

  • Retinacula: Fibrous bands at wrist/ankle
  • Thenar Group: Median nerve innervation
  • Lumbricals: Median and ulnar nerve

Elbow Joints

  • Hinge joint (humerus-ulna/radius), supported by ligaments
  • Radioulnar Joints: Proximal/distal, pivot type

Knee Joint

  • Extracapsular Ligaments: Outside joint capsule
    • LCL, MCL, Patellar ligament, Quadriceps tendon, ACL, PCL
    • Menisci: Fibrocartilage, shock absorbers

Ankle Joint

  • Talocrural Joint: Tibia/fibula with talus
  • Deltoid and Lateral Ligaments: Supports

Rectus Sheath and Abdominal Wall

  • Formed by oblique muscles aponeuroses
  • Arcuate line: Below which no posterior rectus sheath

Abdominal Wall Nerves

  • Thoracoabdominal N: Lower intercostal nerves
  • Subcostal N, Iliohypogastric N, Ilioinguinal N

Heart and Circulation

  • Right Atrium: Receives from vena cava, coronary sinus
  • AV Valves: Chordae tendineae, papillary muscles hold
  • Pacemaker: SA node sets heart rate

Coronary Circulation

  • Right Coronary A: Marginal, SA/AV nodal, posterior A
  • Left Coronary A: LAD, circumflex, marginal
  • Venous Drainage: Coronary sinus system, great/middle/small cardiac veins

Fetal Circulation

  • Umbilical arteries become ligaments
  • Ductus venosus, foramen ovale, ductus arteriosus changes postpartum

Pathologies

  • Arteriosclerosis: Artery wall thickening
  • Aneurysm: Vessel wall bulge

Lungs and Pleura

  • Trachea: Bifurcates, open via cartilage rings
  • Pleura Types: Cervical, costal, diaphragmatic, mediastinal

Digestive System

  • Peritoneum: Serous membrane
  • Mesenteries: Organ support and stabilization
  • Intraperitoneal vs. Retroperitoneal Organs: Organ positioning relative to peritoneum

Abdominopelvic Wall Muscles

  • Quadratus lumborum, Iliacus, Psoas major/minor

Posterior Abdominal Wall Nerves

  • Lumbar Plexus: Iliohypogastric, ilioinguinal, genitofemoral, lateral femoral cutaneous, femoral, obturator nerves

Gastrointestinal Tract

  • Small Intestine: Divided into duodenum, jejunum, ileum
    • Duodenum: Mixes chyme, digestive secretions
    • Jejunum: Absorption site
    • Ileum: Controls flow to cecum

Large Intestine

  • Function: Compaction, feces formation
  • Divided into ascending, transverse, descending, sigmoid
  • Cecum, Appendix, Rectum: Storage, elimination of fecal matter

Accessory Digestive Organs

  • Pancreas: Exocrine/endocrine functions
  • Liver: Bile secretion, nutrient storage
  • Gallbladder: Bile storage
  • Biliary Apparatus: Duct system for bile transport

Other Systems

  • Spleen: Immune response, RBC reservoir
  • Adrenal Glands: Hormone production

Male Reproductive System

  • Testes: Sperm production
  • Ducts: Transport sperm
  • Prostate and Seminal Vesicles: Fluid secretion

Female Reproductive System

  • Ligaments: Broad, suspensory, round
  • Uterus, Vagina, Uterine Tubes: Reproductive functions

External Genitalia

  • Perineum: Area between pubic symphysis and anus
  • Homologous Structures: Labia and scrotum comparatives

Skull Anatomy

  • Divided into neurocranium and viscerocranium
  • Sutures, foramina, and fossae detailed

Meninges and Cranial Spaces

  • Dura Mater: Protects brain, forms sinuses
  • Arachnoid Mater: Delicate layer, CSF suspension
  • Pia Mater: Adheres to the brain surface

Brain Structures

  • Cerebrum, Diencephalon, Brainstem, Cerebellum: Functional areas
  • Limbic System: Emotional processing

Neck Viscera

  • Endocrine, Respiratory, Alimentary Systems: Associated organs
  • Thyroid and Parathyroid Glands: Hormonal regulation

Respiratory and Alimentary Pathways

  • Larynx: Voice production, air/food routing
  • Pharynx: Shared respiratory/digestive path