Feline Anatomy Reference Sheets Feline Biology Reference Series
Skeletal System & Adaptations
SYSTEMS STUDY 01
Fig. 1.1: Feline Osteology (Lateral View)
Cranium Cervical Vertebrae Thoracic Vertebrae Lumbar Vertebrae Caudal Vertebrae Pelvis Femur Patella (Knee Cap) Tibia & Fibula Metatarsus Scapula (Shoulder Blade) Humerus Radius & Ulna Metacarpus Ribcage
Feline Skeletal Specializations
The cat's skeleton is highly optimized for stealth, speed, and agility. Unlike humans, a cat's collarbone (clavicle) is free-floating and buried in muscle tissue, allowing the shoulders to compress tightly. This lets felines squeeze through any opening that accommodates their head.
Key Anatomical Facts
Flexible Spine: The vertebrae are connected by flexible, cushioning discs, allowing the cat to arch its back up to 180 degrees during movement.Digitigrade Posture: Cats walk on their toes (digits). This lifts the heel off the ground, maximizing stride length and enabling silent, spring-like steps.Tail Balance: The caudal vertebrae act as a critical dynamic counterweight during high-speed leaps and rapid, aerial turns.
Feline Biology Reference Series
Internal Organ Systems
SYSTEMS STUDY 02
Fig. 2.1: Simplified Feline Visceral Anatomy
Brain Trachea Heart Lungs Stomach Kidney Liver Small Intestine Large Intestine Urinary Bladder Esophagus
Obligate Carnivore Adaptations
Felines are true (obligate) carnivores, meaning their survival depends entirely on meat. Their digestive tract is exceptionally short because meat is easy to digest compared to plants. Their stomach contains highly acidic juices to kill bacteria and dissolve bone fragments and raw meat quickly.
Vital Physiological Stats
Circulatory Rate: A cat's resting heart rate averages between 140 and 220 beats per minute, supporting rapid bursts of movement.Respiration: Normal resting respiration is 20 to 30 breaths per minute, increasing dramatically during cooling or hunting.Water Conservation: Feline kidneys are highly efficient, allowing them to concentrate urine and maintain hydration even on low fluid intake. Feline Anatomy Practice Worksheets Feline Biology Lab Worksheet
Skeletal System Diagram
PRACTICE 01
Student Name:
Date:
Word Bank
• Cranium
• Cervical Vertebrae
• Thoracic Vertebrae
• Lumbar Vertebrae
• Caudal Vertebrae
• Pelvis
• Femur
• Patella
• Tibia & Fibula
• Metatarsus
• Scapula
• Humerus
• Radius & Ulna
• Metacarpus
• Ribcage
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Adaptation Analysis Question:
Felines possess a "free-floating" clavicle (collarbone) that is not fused to other bones. Based on your reference materials, explain how this specific skeletal adaptation aids a cat in hunt tactics and movement through restricted spaces.
Feline Biology Lab Worksheet
Internal Organ Systems
PRACTICE 02
Student Name:
Date:
Word Bank
• Brain
• Trachea
• Heart
• Lungs
• Stomach
• Kidney
• Liver
• Small Intestine
• Large Intestine
• Urinary Bladder
• Esophagus
A B C D E F G H I J K
A
B
C
D
E
F
G
H
I
J
K
Obligate Carnivore Question:
The digestive system of a feline is significantly shorter in ratio to body length compared to that of a herbivore (like a rabbit or deer). Using biological principles, explain why an all-meat diet allows for a shorter gastrointestinal tract.
Feline Anatomy Answer Key Teacher Resource • Answer Key
Skeletal System Key
ANSWER KEY 01
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
1
Cranium
2
Cervical Vertebrae
3
Thoracic Vertebrae
4
Lumbar Vertebrae
5
Caudal Vertebrae
6
Pelvis
7
Femur
8
Patella
9
Tibia & Fibula
10
Metatarsus
11
Scapula
12
Humerus
13
Radius & Ulna
14
Metacarpus
15
Ribcage
Model Answer:
Expected Student Response: The free-floating collarbone allows a cat's shoulders to compress significantly. This allows them to pass through any gap that matches the size of their skull, a vital trait for stalking prey in narrow brush. Additionally, it increases stride length and flexibility during sprints, dampening landing shocks when jumping from elevated locations.
Teacher Resource • Answer Key
Internal Organ Systems Key
ANSWER KEY 02
A B C D E F G H I J K
A
Brain
B
Trachea
C
Heart
D
Lungs
E
Stomach
F
Kidney
G
Liver
H
Small Intestine
I
Large Intestine
J
Urinary Bladder
K
Esophagus
Model Answer:
Expected Student Response: Animal protein and fats (meat) are far easier to break down biochemically than fibrous plant cell walls (cellulose). As a result, felines do not require the massive, multi-chambered stomachs or extensive cecums that herbivores use for bacterial fermentation, allowing for a short, rapid, and highly efficient digestive tract.
