Blood Supply & Nerve Supply of Bone
Bone is a living, metabolically active tissue. Although its matrix is hard and mineralized, bone contains blood vessels, nerves, marrow and living bone cells. An adequate vascular supply is essential for bone nutrition, remodeling, growth and repair.
The blood supply of a typical long bone comes from several arterial sources, including nutrient, periosteal, metaphyseal and epiphyseal arteries. Nerves accompany many of these vascular pathways and are particularly important for pain sensation.
Interactive Blood Supply Guide
Click the buttons to focus on the major vascular components of a long bone.
Why Does Bone Need a Blood Supply?
Bone contains living cells that require oxygen and nutrients. Blood vessels also remove metabolic waste products and participate in the processes involved in bone growth, remodeling and repair.
The vascular system is particularly important after a fracture because new blood vessels and adequate perfusion are required for normal healing.
Blood Supply of a Typical Long Bone
The blood supply of a long bone can be described according to the region supplied and the route taken by the vessels.
The four major arterial sources are:
- Nutrient arteries
- Periosteal arteries
- Metaphyseal arteries
- Epiphyseal arteries
These vascular systems communicate with one another through an extensive network within the bone.
1. Nutrient Artery
The nutrient artery is an important source of blood supply to a long bone. It usually enters the shaft through an opening called the nutrient foramen.
The nutrient artery passes through the nutrient canal and enters the medullary cavity. Within the medullary region, it divides into branches that run toward the two ends of the bone.
Smaller branches extend toward the endosteal and cortical regions and communicate with other vascular networks.
Nutrient Foramen
The nutrient foramen is an opening through which the nutrient artery enters the bone.
Its location and direction vary between bones. The nutrient canal is generally directed away from the growing end of a long bone, a classic anatomical observation commonly remembered by the phrase:
"To the elbow I go, from the knee I flee."
This is a useful traditional rule for remembering the direction of nutrient canals, although individual bones and variations should be considered anatomically.
2. Periosteal Arteries
The periosteum is a vascular connective-tissue covering on the external surface of most bones, except at articular surfaces.
Periosteal arteries form a vascular network within the periosteum and send small branches into the underlying cortical bone.
Within compact bone, vascular channels connect vessels in different regions. The Haversian canals run mainly longitudinally within osteons, while Volkmann canals provide transverse or oblique connections between vascular channels.
3. Metaphyseal Arteries
The metaphysis is the region between the diaphysis and epiphysis of a developing long bone.
Metaphyseal arteries arise from nearby systemic vessels and enter the bone near the metaphysis. They contribute to the vascular network of this region and may communicate with vessels arising from the nutrient circulation.
The metaphysis is also an important region of bone remodeling and vascular activity.
4. Epiphyseal Arteries
The epiphyseal arteries supply the epiphysis, particularly the regions close to the joints.
These vessels commonly arise from vascular networks around the joint and enter the epiphysis from its surface.
In a growing long bone, the epiphyseal and metaphyseal circulations are influenced by the presence of the epiphyseal growth plate. The vascular relationship changes after growth plate closure.
Blood Supply of Compact Bone
Compact bone contains microscopic vascular channels associated with its osteonal structure.
The central canal of an osteon contains blood vessels and nerves. These channels are connected with other vascular pathways through perforating channels.
- Haversian canals: Run mainly longitudinally within osteons.
- Volkmann canals: Connect vascular channels across the compact bone.
- Periosteal vessels: Supply the external cortical region.
- Nutrient vessels: Provide an important internal source of blood supply.
Blood Supply of Cancellous Bone
Cancellous bone has a rich vascular environment associated with its trabecular framework and marrow spaces.
Blood vessels in the marrow spaces supply nearby bone cells. Because osteocytes are embedded within the mineralized matrix, nutrients and oxygen reach them through the microscopic canalicular network.
This vascular arrangement is particularly important in the epiphyses and other regions containing substantial amounts of trabecular bone.
Venous Drainage of Bone
Arterial blood entering bone eventually passes through a network of smaller vessels and venous channels.
In long bones, venous blood from the medullary region drains toward larger venous channels and leaves the bone through appropriate foramina and periosteal or other communicating veins.
The exact venous arrangement varies according to the bone and its region.
Nerve Supply of Bone
Nerves accompany blood vessels as they enter and travel within bone. Bone is therefore not simply an inert mineralized structure; it contains sensory and autonomic neural elements.
Periosteal Nerves
The periosteum is highly sensitive to pain. Stretching, injury or inflammation of the periosteum can therefore produce significant pain.
Nerves Within Bone
Nerve fibers can accompany vascular channels into the cortical and medullary regions. They are particularly associated with vascular and metabolically active areas.
Bone innervation has roles beyond pain sensation and is also involved in the regulation of vascular function and bone biology.
Blood Supply and Nerve Supply — Quick Comparison
| Structure | Main Role |
|---|---|
| Nutrient artery | Supplies the medullary cavity and internal regions of the long bone. |
| Periosteal arteries | Supply the external and outer cortical regions. |
| Metaphyseal arteries | Supply the metaphyseal region. |
| Epiphyseal arteries | Supply the epiphysis and regions near the joint. |
| Haversian vessels | Travel within osteonal central canals. |
| Volkmann vessels | Connect vascular channels within compact bone. |
| Periosteal nerves | Important for pain sensation from the periosteum. |
Clinical Importance
- Fracture healing: Adequate blood supply is essential for normal bone repair. Severe disruption of vascularity can impair healing.
- Avascular necrosis: Interruption of the blood supply to a bone or part of a bone can result in ischemic bone damage and necrosis.
- Fracture displacement: Some fractures can damage vessels supplying important bone segments, making vascular assessment clinically important.
- Bone infection: The vascular anatomy of bone influences the spread and localization of osteomyelitis.
- Periosteal pain: The sensitivity of the periosteum explains the significant pain associated with many injuries involving the bone surface.
High-Yield MBBS Points
- Long bones receive blood from nutrient, periosteal, metaphyseal and epiphyseal arteries.
- The nutrient artery enters the shaft through the nutrient foramen.
- The nutrient artery enters the medullary cavity and divides into branches toward the ends of the bone.
- Periosteal vessels supply the external regions of bone.
- Haversian canals contain vessels within osteons.
- Volkmann canals connect vascular channels within compact bone.
- Metaphyseal arteries supply the metaphyseal region.
- Epiphyseal arteries supply the epiphysis.
- The periosteum is highly sensitive to pain.
- Blood supply is essential for fracture healing and bone remodeling.
Summary
Bone has an extensive vascular and neural supply despite its hard mineralized appearance. In a typical long bone, the major arterial sources are the nutrient, periosteal, metaphyseal and epiphyseal arteries. These vessels form interconnected networks that supply the marrow, cortical bone and trabecular regions.
Nerves accompany many vascular pathways and are especially important for pain sensation in the periosteum. Understanding the vascular and neural anatomy of bone is important for understanding bone growth, remodeling, fracture healing and conditions such as avascular necrosis.
Image Credits & Licenses
1. Blood Supply to Bone:
OpenStax College,
609 Body Supply to the Bone.jpg.
Licensed under CC BY 3.0.
Source:
Wikimedia Commons
2. Nutrient Vessel:
James Heilman, MD,
Nutrientvessel.png.
Licensed under CC BY-SA 3.0.
Source:
Wikimedia Commons
Medical Disclaimer: The information provided in this article is strictly for educational, study, and exam-preparation purposes. It does not constitute professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider for clinical decisions.