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Sensory organs are specialized organs that detect stimuli  (touch, light, sound, smell, taste) and transmit signals to the central nervous system  via sensory receptors. FUNCTIONS OF SENSORY ORGANS Detect environmental changes Maintain body homeostasis Protect body from danger Help communication Coordinate body functions Maintain balance & posture 1. SKIN (Organ of Touch) Structure of Skin Skin is the largest organ  of the body. Surface area = 1.5–2 m² Layers of Skin 1. Epidermis Outer protective layer. Cells: Keratinocytes Melanocytes Langerhans cells Layers of epidermis: Stratum corneum Stratum lucidum (only palms & soles) Stratum granulosum Stratum spinosum Stratum basale Function: Protection Prevents water loss Melanin formation 2. Dermis Contains: Blood vessels Nerve endings Hair follicles Sweat glands Sebaceous glands Layers: Papillary layer Reticular layer Function: Sensation Nourishment of epidermis Temperature regulation 3. Hypodermis (Subcutaneous tissue) Contains: Fat Connective tissue Function: Insulation Energy storage Shock absorption Skin Appendages Hair Nails Sweat glands Sebaceous glands Functions of Skin Protection Sensation Temperature regulation Excretion of waste Vitamin D synthesis Immune defense Nursing Implications – Skin Prevent pressure ulcers Skin assessment (color, moisture) Wound dressing Burn management Infection prevention IV cannula site monitoring Maintain hygiene Patient turning schedule 2. EYE (Organ of Vision) Structure of Eye Diameter = 2.5 cm Layers of Eyeball 1. Fibrous layer Sclera Cornea 2. Vascular layer (Uvea) Choroid Ciliary body Iris 3. Retina (nervous layer) Contains photoreceptors: Rod cells – night vision Cone cells – color vision Parts of Eye Part Function Cornea refracts light Iris controls pupil size Pupil regulates light entry Lens focuses image Retina image formation Macula central vision Optic nerve carries impulses Aqueous humor maintains pressure Vitreous humor maintains shape Functions of Eye Vision Light perception Color detection Depth perception Nursing Implications – Eye Visual acuity assessment Eye drop administration Prevent infection Cataract patient care Glaucoma monitoring Eye irrigation procedure Postoperative care 3. EAR (Organ of Hearing and Balance) Structure of Ear 1. External ear Pinna External auditory canal Function : Collects sound waves 2. Middle ear Contains ossicles: Malleus Incus Stapes Function : Amplifies sound vibrations 3. Inner ear Cochlea → hearing Vestibule → balance Semicircular canals → equilibrium Functions of Ear Hearing Balance Position sense Nursing Implications – Ear Hearing assessment Ear irrigation Ear drop administration Prevent infection Care for vertigo patients Post ear surgery care 4. NOSE (Organ of Smell) Structure of Nose Parts: External nose Nasal cavity Nasal septum Nasal conchae Olfactory receptors Olfactory nerve Functions of Nose Smell sensation Filters dust particles Humidifies air Warms inspired air Nursing Implications – Nose Oxygen therapy administration NG tube insertion Nasal suctioning Allergy care Epistaxis management Infection prevention 5. TONGUE (Organ of Taste) Structure of Tongue Muscular organ present in oral cavity. Contains papillae: Filiform papillae Fungiform papillae Circumvallate papillae Foliate papillae Taste Sensations Sweet Sour Salty Bitter Umami Functions of Tongue Taste sensation Speech Swallowing Chewing assistance Nursing Implications – Tongue Oral hygiene care Nutritional assessment Detect dehydration Identify vitamin deficiency Assist feeding patient Detect oral infection Monitor tongue color changes SUMMARY TABLE Organ Structure importance Nursing importance Skin protective layers wound care Eye retina & lens vision care Ear cochlea hearing care Nose olfactory cells oxygen therapy Tongue taste buds oral care

For 2nd Year B.Sc Nursing (INC Syllabus)

Structure, Classification, Morphology, Growth, Motility, Colonization & Identification

Principles, Types & Nursing Responsibilities

Detailed Notes for 2nd Year B.Sc Nursing (INC Syllabus)

Detailed Notes for 2nd Year B.Sc Nursing (INC Syllabus) Staining techniques are important in microbiology to identify microorganisms  under microscope. Microorganisms are usually colorless , so stains are used to make them visible  and help identify their shape, structure, and type . 📌 Learning Objectives After studying this topic, student will be able to: define staining explain purpose of staining describe types of staining techniques understand Gram staining steps identify microorganisms using staining methods 1️⃣ Definition of Staining Staining  is the process of applying color (dye)  to microorganisms to make them visible under microscope. Purpose: increase visibility identify shape differentiate types of bacteria observe cell structure 2️⃣ Purpose of Staining Staining helps to: identify bacteria study morphology differentiate gram positive and gram negative bacteria observe internal structures diagnose infection 🧠 Mnemonic – Purpose of staining "VISID" V – Visibility I – Identify bacteria S – Study structure I – Identify type D – Diagnose disease 3️⃣ Types of Staining Techniques Staining techniques mainly classified into: Simple staining Differential staining Special staining 4️⃣ Simple Staining Uses only one stain. Purpose: observe size observe shape observe arrangement Common dyes: methylene blue crystal violet safranin Example: Cocci appear blue under microscope. 5️⃣ Differential Staining Used to differentiate bacteria based on cell structure. A. Gram Staining (Most important) Gram staining differentiates bacteria into: Gram positive bacteria Colour: Purple Cell wall: Thick peptidoglycan layer Example: Staphylococcus Gram negative bacteria Colour: Pink Cell wall: Thin peptidoglycan layer Example: E.coli Steps of Gram Staining Apply crystal violet stain Add iodine solution Wash with alcohol Counter stain with safranin B. Acid Fast Staining (Ziehl-Neelsen stain) Used to identify bacteria with waxy cell wall. Example: Mycobacterium tuberculosis Result: Acid fast bacteria appear red. 6️⃣ Special Staining Techniques Used to identify specific structures. Capsule staining Shows capsule around bacteria. Example: Klebsiella Spore staining Shows bacterial spores. Example: Clostridium Flagella staining Shows bacterial flagella. Negative staining Background stained instead of bacteria. Helps observe capsule. 7️⃣ Importance of Staining in Nursing Helps nurses in: identification of infection selection of antibiotics diagnosis of disease infection control specimen testing 8️⃣ Summary Table Staining type Purpose Simple stain shape Gram stain bacteria type Acid fast stain TB bacteria Capsule stain capsule Spore stain spores 9️⃣ Differences Between Gram Positive and Gram Negative Bacteria Feature Gram positive Gram negative Colour purple pink cell wall thick thin lipid content low high sensitivity to antibiotic more less 🔟 Identification of Microorganism using Staining Staining helps identify: shape of bacteria arrangement gram type presence of capsule presence of spores Exam Important Questions Define staining. Types of staining techniques. Gram staining steps. Difference between gram positive and gram negative bacteria. Acid fast staining. Importance of staining.

Detailed Notes for 2nd Year B.Sc Nursing (INC Syllabus)

Detailed Notes for 2nd Year B.Sc Nursing (INC Syllabus)

Detailed Notes for 1st Year B.Sc Nursing (INC Syllabus)

Hospital Infection Control Programme, Protocols, Sample Collection, Report, Infection Rate, Nurse Accountability, Continuing Education