Tin tức và sự kiện

Não người: Những điều có thể bạn chưa biết

Cập nhật lúc: 9:34:40 SA - 17/05/2010

Với trọng lượng trung bình chỉ bằng khoảng 1/50 trọng lượng cơ thể, nhưng não bộ lại là nơi nắm giữ và điều khiển toàn bộ hoạt động của cơ thể con người.

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Não người. Ảnh: National Geographic.

Chỉ với trọng lượng trung bình vào khoảng 1,4kg song não người được xem là một cấu trúc sống phức tạp nhất được biết đến hiện nay. Số lượng các nơ - ron thần kinh lên đến ngàn tỷ, liên kết và phối hợp với nhau để điều khiển các hoạt động thể chất cũng như tinh thần của con người.

Não và tủy sống

Mô tả ảnh.
Não và tủy sống. Ảnh: National Geographic.

Não và tủy sống hợp với nhau tạo nên hệ thống thần kinh trung ương. Đây là bộ máy quan trọng để điều khiển và kiểm soát các hoạt động thể chất của con người

Các nơ – ron thần kinh

Mô tả ảnh.
Nơ-ron thần kinh. Ảnh: National Geographic.

Não bộ con người có khoảng nghìn tỷ tế bào nơ - ron thần kinh. Những tế bào này liên kết với nhau để truyền các xung điện và thông tin đến các tế bào khác trong cơ thể. 

Bộ não dưới hình ảnh chụp cộng hưởng từ

Mô tả ảnh.
Bộ não dưới hình ảnh chụp cộng hưởng từ. Ảnh: National Geographic.

Với kỹ thuật chụp cộng hưởng từ (MRI), con người có được một cái nhìn vô cùng chi tiết, sinh động với các hình ảnh 3D của bộ não. Việc chụp cộng hưởng từ được xem là một trong những phương pháp rất quan trọng để có thể phát hiện ra những dấu hiệu bất thường trong bộ não như khối u hay các bệnh khác. Kỹ thuật này cũng góp phần đưa ra các cảnh báo về mức độ chấn thương não bộ một cách chính xác.

Những lát cắt não bộ

Mô tả ảnh.
Một lát cắt não bộ. Ảnh: National Geographic.

Nhờ các kỹ thuật cắt chính xác, các nhà nghiên cứu có thể kiểm tra một lát cắt mỏng của não bộ con người. Các bác sĩ phẫu thuật cũng có thể cắt não sống mà không sợ làm tổn thương bệnh nhân cũng như không khiến các cơ quan khác bị cảm giác đau đớn.

Khối u não

Bằng sự khéo léo của mình, các bác sĩ phẫu thuật tại trung tâm y tế UCLA ở Los Angeles, California đã cắt bỏ một khối u não của người phụ nữ. 

Mô tả ảnh.
Khối u não. Ảnh: National Geographic.

Các khối u não ác tính là một trong những nguyên nhân gây tử vong rất cao ở người. Các khối u ngăn cản sự hoạt động bình thường của não bộ. Bất kỳ một khối u não nào cũng nén mất một vùng não, làm tăng áp lực nội bộ, xáo trộn sự cân bằng của các cơ quan chức năng.

 

Đỗ Hòa (Theo National Geographic)

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