Gluteal region: topography and pathways of tracking abscesses
The adipose tissue of the gluteal region is distributed between powerful muscle layers. In operative surgery, two key spaces are distinguished that determine the severity and pathways of infection spread.
Subgluteal fascial space This is an extensive zone located between the gluteus maximus and the middle muscle layer. It is precisely here that all major neurovascular bundles leaving the pelvic cavity through the suprapiriform and infrapiriform foramina pass. The space has clear boundaries:
- Anterior wall: fascia covering the muscles of the middle layer.
- Posterior wall: deep layer of the own fascia of the gluteus maximus muscle.
- Superiorly: the compartment is hermetically sealed due to the attachment of the deep fascia to the iliac crest.
- Medially: the space is isolated by the attachment of the same fascia to the sacrum and coccyx.
Osteofibrous space of the gluteus medius and minimus muscles The gluteus minimus is completely covered by the gluteus medius, and both are enclosed in a dense osteofibrous sheath. Due to the absolute confinement of this compartment, purulent processes here are accompanied by extremely high tissue pressure. This determines the extremely severe clinical course of phlegmons in this localization.
Anterior forearm and Parona's space
Anterior forearm region (regio antebrachii anterior) includes hand and finger flexors, pronators, and three major neurovascular bundles. This is a clinically important zone: main arteries used in reconstructive surgery pass here, and pathways for the migration of purulent processes are formed.
Of greatest surgical significance is Parona's space — the deep compartment of the anterior fascial sheath of the forearm. It is localized between the third and fourth muscle layers and has the following boundaries:
- Anteriorly: the deep (posterior) surface of the muscles of the third layer — the flexor pollicis longus (m. flexor pollicis longus) and flexor digitorum profundus (m. flexor digitorum profundus).
- Posteriorly: the interosseous membrane (membrana interossea) and pronator quadratus (m. pronator quadratus) along with its own fascia.
- Laterally: the anterior radial intermuscular septum, which reliably separates the space from the brachioradialis muscle (m. brachioradialis).
- Medially: the forearm fascia, tightly fused with the ulna.
Clinical significance: Parona's space has direct communication with the synovial sheaths of the fingers. This is the classical anatomical pathway through which purulent tracking abscesses spread unhindered from the hand to the forearm and in the opposite direction.
Temporal region: layers and connections with deep facial compartments
The adipose tissue of the temporal region has a distinct layered structure and forms three tiers, each of which has its own characteristics and pathways of infection spread.
- Interaponeurotic space. Located above the zygomatic arch, sandwiched between the superficial and deep leaves of the temporal fascia (fascia temporalis). It is completely closed within the fascial splitting.
- Subaponeurotic space. Located between the deep leaf of the temporal fascia and the outer surface of the temporalis muscle (m. temporalis). Inferior to the zygomatic arch, it transitions into the masticator-jaw cleft, from which a pathway opens into the adipose tissue of the deep lateral facial region (parapharyngeal and pterygomandibular spaces). This explains the possibility of pus migration from the temple to the deep parts of the face and neck, as well as in the reverse direction.
- Deep (subtemporal / submuscular) space. Lies between the temporalis muscle and the periosteum of the temporal bone. Communicates freely with the adipose tissue of the infratemporal fossa and the deep lateral facial region.
An additional anatomical pathway for infection spread is the temporal process of the buccal fat pad (corpus adiposum buccae). It lies beneath the aponeurosis between the anterior edge of the temporalis muscle and the outer orbital wall, connecting the temporal zone with the buccal and orbital adipose tissue.
Rule of the temporal region: the deeper the fascial space is located, the broader its connections. The superficial (interaponeurotic) space is completely enclosed, while the deep layers communicate freely with the spaces of the face and neck.
Class and exam questions
Why do phlegmons of the gluteus minimus and medius muscles run a particularly severe course?
These muscles are enclosed in an absolutely confined osteofibrous space. When purulent inflammation develops, tissue pressure rapidly increases there, exacerbating the severity of the patient's condition.
How can pus from the fingers of the hand reach the forearm?
The purulent process spreads proximally along the synovial sheaths of the fingers. They communicate directly with the deep fascial space of Parona, located on the anterior surface of the forearm.
Where can infection from the subaponeurotic adipose tissue of the temple spread?
Purulent tracking abscesses descend below the zygomatic arch into the masticator-jaw cleft. From there, the infection easily penetrates into the pterygomandibular and parapharyngeal spaces of the deep lateral facial region and neck.
What else to study on this topic
- Topography of the supra- and infrapiriform foramina of the pelvis
- Main arteries of the anterior forearm region in reconstructive surgery
- Anatomy of the synovial sheaths of the hand and fingers
- Topography of the deep lateral facial region (pterygomandibular and parapharyngeal spaces)
- Structure and processes of the buccal fat pad (corpus adiposum buccae)
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